گردهمایی سراسری فیزیک ایران، 6 دی ماه 1397، دانشکده فیزیک ...Effects of low-dimensional material channels on energy ... Synthesis and characterization

ن، دانشکده فیزیک دانشگاه تهرا7931دی ماه 6گردهمایی سراسری فیزیک ایران،

1

7931دی ماه ۶ فیزیک ایران سراسریبرنامه گردهمایی

فیزیک ماده چگال( )سخنرانی عمومی، 7سالن

ساعت کد

مقالهرئیس عنوان مقاله سخنران

جلسه

8:55-8:55 افتتاحیه

ییم

کرر

کتد

ور

پ

0:99-0::5 P99 M. T. Tavassoly, H. Salvdari Generalized Interfrometry

0::5-0:59 P57

B .Bazgir, A. Ollé, L. Tumung, L. Becerra-Valdivia, K. Douka, T.

Higham, J. van der Made, A. Picin, P.

Saladié, J. M. López-García, H .A. Blain, E. Allué, M. Fernández-García,

I. R .Rodríguez, D. Arceredillo, F.

Bahrololoumi, M. S. Azimi, M. Otte,

E. Carbonell

Understanding the emergence of modern humans and the

disappearance of Neanderthals: Insights from Kaldar Cave

(Khorramabad Valley, Western Iran)

استراحت و پذیرایی 0:59-09:99

09:99 P5 M. Payami, T. Mahmoodi Density-functional theory study of ionic inhomogeneity in metal

clusters using SC-ISJM

یالی

ظ عواع

ر کت

د

09:05 P68 H. Yarloo, A. Langari, A. Vaezi Anyonic self-induced disorder in a stabilizer code: Quasi many-

body localization in a translational invariant model

09:09 P113 F. Heydarinasab, J. Abouie Spin supersolid phase in coupled alternating spin chains

09:55 P108 M. Kargarian, Y.M. Lu, M. Randeria Deformation and stability of surface states in Dirac semimetals

00:99 P91 A. Rajabpour; Z. Fan; S. M. Vaez

Allaei

Inter-layer and intra-layer heat transfer in bilayer/monolayer

graphene van der Waals heterostructure: Is there a Kapitza

resistance analogous?

00:05 P39 A. Sadeghi Superlubricity controlled by the multiatomic nature of nanocontacts

00:09 P56 Z. Shomali, R. Asgari Effects of low-dimensional material channels on energy

consumption of nano-devices

00:55 P84 S. Khajoei Gharaei, M.

Abbasnejad, R. Maezono Bandgap reduction of photocatalytic TiO2 nanotube by Cu doping

0::99 P64 Z. Torbatian, R. Asgari Optical absorption properties of few-layer phosphorene

0::05 P25 M. Ansari-Rad, S.

Athanasopoulos

Theoretical study of equilibrium and nonequilibrium exciton

dynamics in disordered semiconductors

ناهار 09-05:09::0

05:09 P114 Z. Alborzi , V. Daadmehr Synthesis and characterization of iron based superconductor Nd-1111

یگر

لنتر

دک

05:55 P17 A. Eskandari-asl Influence of a thermal bath on the transport properties of an open

molecular junction

05:99 P2 M. Zare, L. Majidi, R. Asgari Giant magnetoresistance and anomalous transport in phosphorene-

based multilayers with noncollinear magnetization

05:05 P81 A. Nourmohammadi, H.

Mohammadi Fesharaki

Improving the soft magnetic properties of the

Fe73.5Si13.5B9Nb3Cu1 nanostructured ribbons by annealing in the

hydrogen atmosphere

05:09 P89

H. Asnaashari Eivari, S. A. Ghasemi,

H. Tahmasbi, S. Rostami, S. Faraji, R. Rasoulkhani, S. Goedecker, M.

Amsler

Two-Dimensional Hexagonal Sheet of TiO 2

05:55 P42 S. Salehi, A. Saffarzadeh Optoelectronic properties of defective MoS2 and WS2 monolayers

00:99 P77 M. Javadi, Yaser Abdi Frequency-driven bulk-to-surface transition of conductivity in ZnO

nanowires


نشست مشورتی انجمن 00:55-08:55


2


)مکانیک آماری و ماده چگال نرم( ۲سالن

ساعت کد


جلسه

09:99-8:55

09:99 P47 A. Rezaie-Dereshgia, F.

Mohammad-Rafiee

Effects of dielectric inhomogeneity on electrostatic twist rigidity of a

helical biomolecule in Debye-Huckel regime

یهر

سپر

کتد

نیا

09:05 P28

T. Heydari, M. Heidari, O.

Mashinchian, M. Wojcik, K.

Xu, M. J. Dalby, M.

Mahmoudi, M. R. Ejtehadi

Development of a virtual cell model to predict cell response to substrate

topography

09:09 P59 M. Fazilati, N. Maleki-

Jirsaraei, Sh. Rouhani, D. Bonn Quasi-periodic and irregular motion of a solid sphere falling through a

thixotropic yield-stress fluid

09:55 P112 A. H. Shirazi, A. A. Saberi, A.

Hosseiny, E. Amirzadeh, P.

Toranj Simin

Non-criticality of interaction network over system’s crises: A

percolation analysis

00:99 P107 M.ohsen Amini Spread of wave packets in disordered hierarchical lattices

00:05 P98

R. Akbari, G. R. Chagas, G.

Godeau, M. R.

Mohammadizadeh, F. Guittard,

T. Darmanin

Intrinsically water-repellent copper oxide surfaces; an electro-

crystallization approach

00:09 P71 S. R. Seyednejad, M. R.

Mozaffari, T. Araki, E.

Nedaaee Oskoee

Interactions between pentagonal truncated pyramids with homeotropic

anchoring in a nematic liquid crystal

00:55 P29 S.Fathizadeh, S. Behnia, J.

Ziaei

DNA Molecule Bridge between Metal Electrodes for High-

Performance Molecular Transistor: An Environmental Dependent

Approach

0::99 P109 K. Farain, A. Esfandiar, A. R.

Z. Moshfegh

Universal rotation of nanowires in static uniform electric fields in

viscous dielectric liquids

ناهار 09-05:09::0

05:09 P100 M. Arshadi Pirlar, S. M. S.

Movahed, D. Razzghi, R.

Karimzadeh

Crossing statistics of laser light scattered through a nanofluid

ییام

ر پکت

د

05:55 P106 Z. Sohbatzadeha, H.

Asnaashari Eivarib, D. Vahedi

Fakhrabad

Formation energy and some mechanical properties of hydrogenated

hexagonal monolayer of GeC

05:99 P96

F. Mohammadpour, M.

Heydari Dokoohaki, A. R.

Zolghadr, M. H. Ghatee, M.

Moradi

Confinement of aqueous mixtures of ionic liquids between amorphous

TiO2 slit nanopores: electrostatic field induction

05:05 P85 M. Yousefi, M. Faraji, R.

Asgari, A. Z. Moshfegh

Effect of boron and phosphorus codoping on the electronic and optical

properties of graphitic carbon nitride monolayers: First-principle

simulations

05:09 P83 M.F. Miri, Z. Etesami Synchronized motion of noncontact rack-and-pinion devices subject to

thermal noise

و پذیرایی استراحت 00:05-00:55



3


اطالعات کوانتومی ( ) 9لن سا

ساعت کد


جلسه

09:99-8:55

09:05 P75 F. Shahbeigi, S. J. Akhtarshenas Quantumness of quantum channels

ییم

کرر

کتد

ور

پ

09:09 P31 F. T. Tabesh, Sh. Salimi, A. S.

Khorashad Witness for initial correlations among environments

09:55 P48 M. Abdi, M. B. Plenio Analog quantum simulation of extremely sub-Ohmic spin-boson

models

00:99 P78 L. Memarzadeh, A. Mani Thermal effects on coherence and excitation transfer

00:05 P46 M. H. Zarei, A. Montakhab Dual correspondence between quantum CSS states and classical spin

models

00:09 P103 P. Khakbiz, M. Asoudeh Sequential quantum secret sharing in noisy environments

00:55 P116 F. Rezazadeh, A. Mani, V.

Karimipour Secure alignment of coordinate systems using quantum correlation

ناهار 09-05:09::0

05:09 P55 J. Khatibi Moqadam, A. T.

Rezakhani

Boundary-induced coherence in the staggered quantum walk on

different topologies

سشنا

تراخ

ر کت

د

05:55 P54 R. Taghiabadi, S. J.

Akhtarshenas, M. Sarbishaei

Reexamination of strong subadditivity: A quantum-correlation

approach

05:99 P19 F. Adabi, S.Haseli, Sh. Salimi Reducing the entropic uncertainty lower bound in the presence

of quantum memory via LOCC

05:05 P110 R. Yazdani, H. Fallahi, Iterative phase retrieval algorithm for reconstruction of two arbitrary

interfering fields




4


اپتیک و لیزر( )فیزیک اتمی، ۴سالن

ساعت کد


جلسه

09:99-8:55

09:05 P74 M. Sohrabi, A. Zarinshad, M.

Habibi

Breakthrough in 4π ion emission mechanism understanding in plasma

focus devices

یسل

تور

کتد

09:09 P38 K. Hassani, A. Jabbari, M. T.

Tavassoly

Application of Fresnel diffraction from a phase step to determination of

the spectral line profile

09:55 P32 S. Rasouli, A. M. Khazaei, D.

Hebri

Radial carpet beams: A class of nondiffracting, accelerating, and self-

healing beams

00:99 p94 Z. Naeimi, M.F. Miri Magnetic and electric hotspots via fractal clusters of hollow silicon

nanoparticles

00:05 P45 S. Panahibakhsh,S. Jelvani,

M. Jaberi

Micro- and nanostructures formation on glass surface with different

parameters of excimer laser irradiation

00:09 P67 R. Talebi Investigating multicolour photochromic behaviour of AgCl and AgI

thin films loaded with silver nanoparticles

00:55 P102 H. Salvdari, M. T. Tavassoly Fresnel diffraction from the edge of a transparent plate in the general

case

ناهار 09-05:09::0

05:09 P79 M. Karimi THEORETICAL STUDY OF THE THERMAL DISTRIBUTION IN YB-

DOPED DOUBLE-CLAD FIBER LASER BY CONSIDERING DIFFERENT

HEAT SOURCES

ال نه

تردک

05:55 P53

M. Gharibzadeh, A. Alam, Y.

Abedini, A.A.

AliakbariBidokhti, A.

Masoumi

Monthly and seasonal variations of aerosol optical properties and direct

radiative forcing over Zanjan, Iran

05:99 P8 N. Mahdizadeh Thermal effect on electron trajectory and growth rate in a two-stream

free electron laser with a guide field




5


و فیزیک ذرات(شناسی کیهان )نجوم و اخترفیزیک، ۵سالن

ساعت کد


جلسه

09:99-8:55

09:05 P97 S.Nasiri, T. Wiegelmann Reconstructing Nonlinear Force-Free Fields by a Constrained

Optimization

ینج

سپر

کتد

09:09 P101 N. Khosravi Über-gravity and the cosmological constant problem

09:55 P105

F. Nikakhtar, M. R.

Ayromlou, Sh. Baghram, S.

Rahvar, M. R. Rahimi Tabar,

R. K. Sheth

The Excursion set approach: Stratonovich approximation and Cholesky

decomposition

00:99 P115 M. Farhang, P. Collaboration Planck 2015 results. XIII. Cosmological parameters

00:05 P76 G. R. Boroun Longitudinal structure function from logarithmic slopes of F2 at low x

00:09 P88 S. Aghapour, Gh. Jafari, M.

Golshani

On variational principle and canonical structure of gravitational theory

in double-foliation formalism

00:55 P82 M. M. Qaemmaqami Butterfly effect in 3D gravity

0::99 P95 S. Cheraghchi, F. Shojai On the initial conditions of scalar and tensor fluctuations in f (R, φ)

gravity

0::05 P87 H. Bouzari Nezhad, F. Shojai The Effect of $\alpha$-Vacua on the Scalar and Tensor Spectral

Indices: Slow-Roll Approximation

ناهار 09-05:09::0

05:09 P44 S. Rahvar Gravitational Grating

وارراه

ر کت

د

05:55 P61 A Vafaei Sadr, S M S

Movahed, M Farhang, C

Ringeval, F R Bouchet

A Multiscale pipeline for the search of string-induced CMB

anisotropies

05:99 P63

A. Vafaei Sadr, M. Farhang,

S. M. S. Movahed, B. Bassett,

M. Kunz

Cosmic string detection with tree-based machine learning

05:05 P12 S. Sabri, S. Vasheghani

Farahani, H. Ebadi, M.

Hosseinpour, Z. Fazel

Alfv́en wave dynamics at the neighbourhood of a 2.5D magnetic null-

point

05:09 P62 I. Eghdami, H. Panahi , S. M.

S. Movahed Multifractal Analysis of Pulsar Timing Residuals: Assessment of

Gravitational Wave Detection

05:55 P58 B. Mostaghel, H. Moshafi, S.

M. S. Movahed The integrated Sachs–Wolfe effect in the bulk viscous dark energy

model

00:99 P43 M. Mohsenzadeh, E. Yusofi Higher order corrections to asymptotic-de Sitter inflation




6


فیزیک( ای و ریاضی هسته ) ۶سالن

ساعت کد


جلسه

09:99-8:55

09:05 P80 H. Mohammadzadeh, M.

Farahmand, M. Maleki Entropy production due to Lorentz invariance violation

دکتر

نصیری

09:09 P65 A. Moradi Marjaneh, V. A.

Gani, D. Saadatmand, S. V.

Dmitriev, K. Javidan

Multi-kink collisions in the φ6 model

09:55 P69 A. Tafrihi The LOCV asymmetric nuclear matter two-body density distributions

versus those of FHNC

00:99 P9

N. Divani Veis, A. Ehret, M.

M. Firoozabadi, R.

Karabowicz, F. Maas, N.

Saito, T. R. Saito, B. Voss, on

behalf of the PANDA GEM-

Tracker subgroup

Implementation of the PANDA Planar-GEM tracking detector in

Monte Carlo simulations

00:05 P72 P. Tayyebi, F. Abbasi Davani,

M. Tabasi, M. Ebrahimkhani,

H. Afarideh

Computational investigation of isotopic signature of radioxenon

released from Tehran research reactor

00:09 P92 M.Rahmat, M.Modarres Folding model analyses of 12C-12C and 16O-16O elastic scattering

using the density-dependent LOCV-averaged effective interaction

ناهار 09-05:09::0

05:09 P93 S. Akhshabi, E. Qorani, F.

Khajenabi Inflation by spin and torsion in the Poincare gauge theory of gravity

تردک

النرد

ا

05:55 P23 H. Ghaffarnejad, E. Yaraie Effects of a cloud of strings on the extended phase space of Einstein–

Gauss–Bonnet AdS black holes

05:99 P40 M. Ghamary, H. Sadeghi, S.

Mohammadi

Astrophysical S-factor of the 3He(alpha, gamma)7Be reaction in the

Big-Bang nucleosynthesis

05:05 P60 Z. Sharifi, A. Bayat, M.

Hamzavi, M. Bigdeli

Spin-isospin effects on Isgur-Wise function for heavy-baryon

transitions




7

Giant magnetoresistance and anomalous transport in phosphorene-based

multilayers with noncollinear magnetization

Moslem Zare, Leyla Majidi, Reza Asgari

We theoretically investigate the unusual features of the magnetotransport in a monolayer phosphorene

ferromagnetic/normal/ferromagnetic (F/N/F) hybrid structure. We find that the charge conductance can

feature a minimum at parallel (P) configuration and a maximum near the antiparallel (AP)

configuration of magnetization in the F/N/F structure with n-doped F and p-doped N regions and also a

finite conductance in the AP configuration with the N region of n-type doping. In particular, the

proposed structure exhibits giant magnetoresistance, which can be tuned to unity. This perfect

switching is found to show strong robustness with respect to increasing the contact length and tuning

the chemical potential of the N region with a gate voltage. We also explore the oscillatory behavior of

the charge conductance or magnetoresistance in terms of the size of the N region. We further

demonstrate the penetration of the spin-transfer torque into the right F region and show that, unlike

graphene structure, the spin-transfer torque is very sensitive to the chemical potential of the N region as

well as the exchange field of the F region.

Density-functional theory study of ionic inhomogeneity

in metal clusters using SC-ISJM

Mahmoud Payami, Tahereh Mahmoodi

In this work we have applied the recently formulated self-compressed inhomogeneous stabilized

jellium model [51] to describe the equilibrium electronic and geometric properties of atomic-closed-

shell simple metal clusters of Al N ( N = 13, 19, 43, 55, 79, 87, 135, 141), Na N , and Cs N ( N = 9, 15,

27, 51, 59, 65, 89, 113). To validate the results, we have also performed first-principles pseudo-

potential calculations and used them as our reference. In the model, we have considered two regions

consisting of “surface ”and “inner ”ones, the border separating them being sharp. This generalization

makes possible to decouple the relaxations of different parts of the system. The results show that the

present model correctly predicts the size reductions seen in most of the clusters. It also predicts

increase in size of some clusters, as observed from first-principles results. Moreover, the changes in

inter-layer distances, being as contractions or expansions, are in good agreement with the atomic

simulation results. For a more realistic description of the properties, it is possible to improve the

method of choosing the surface thicknesses or generalize the model to include more regions than just

two.

P2

P5


8

Thermal effect on electron trajectory and

growth rate in a two-stream free electron laser with a guide field

Nader Mahdizadeh

Temperature effects on the electron trajectory and growth rate are investigated for a two-stream free-

electron laser (FEL) with a helical wiggler along with a guide magnetic field. Both longitudinal and

transverse components of the beam temperature are including providing the full beam temperature

effects. Two different cases namely, conventional and reversed guide field are considered. Based on the

fluid theory, the dispersion relation for the right hand polarized of the electromagnetic wave, including

the important influence of temperature is obtained and solved numerically. Two resonances occur in

this model: FEL and two-stream FEL (TS-FEL) resonances. It is shown that both of the peak growths

of the resonances are reduced due to temperature. However, peak growth rates are substantially

affected owing to transverse component of the beam temperature. The result shows, in the case of a

reversed guide field the TS-FEL resonance has low thermal sensitivity with respect to the conventional

guide field.

Implementation of the PANDA Planar-GEM

tracking detector in Monte Carlo simulations

Nazila Divani Veis, Andre Ehret, Mohammad M. Firoozabadi, Radoslaw Karabowicz, Frank

Maas, Nami Saito, Takehiko R. Saito, Bernd Voss, on behalf of the PANDA GEM-Tracker

subgroup

The PANDA experiment at FAIR will be performed to investigate different aspects of hadron physics

using antiproton beams interacting with a fixed nuclear target. The experimental setup consists of a

complex series of detector components covering a large solid angle. A detector with a gaseous active

media equipped with gas electron multiplier (GEM) technique will be employed to measure tracks of

charged particles at forward direction in order to achieve a high momentum resolution. In this work, a

full setup of the GEM tracking detector has been implemented in the PANDA Monte Carlo simulation

package (PandaRoot) based on the current technical and conceptual design, and the expected

performance of the PANDA GEM-tracking detector has been investigated. Furthermore, material-

budget studies in terms of the radiation length of the PANDA GEM-tracking detector have been made

in order to investigate the effect of the detector materials and its associated structures to particle

measurements.

P8

P9


9

Alfv´ en wave dynamics at the neighbourhood of a 2.5D magnetic null-point

S. Sabri, S. Vasheghani Farahani, H. Ebadi, M. Hosseinpour, Z. Fazel

The aim of the present study is to highlight the energy transfer via the interaction of

magnetohydrodynamic waves with a 2.5D magnetic null-point in a finite plasma-βregime of the solar

corona. An initially symmetric Alfv´ en pulse at a specific distance from a magnetic null-point is

kicked towards the isothermal null-point. A shock-capturing Godunov-type PLUTO code is used to

solve the ideal magnetohydrodynamic set equations in the context of wave-plasma energy transfer. As

the Alfv´ en wave propagates towards the magnetic null-point, it experiences speed lowering which

ends up in releasing energy along the separatrices. In this line owing to the Alfv´ en wave, a series of

events take place that contribute towards coronal heating. Non-linear-induced waves are by-products of

the torsional Alfv´ en interaction with magnetic null-points. The energy of these induced waves which

are fast magnetoacoustic (transverse) and slow magnetoacoustic (longitudinal) waves is supplied by the

Alfv´ en wave. The nonlinearly induced density perturbations are proportional to the Alfv´ en wave

energy loss. This supplies energy for the propagation of fast and slow magnetoacoustic waves, where in

contrast to the fast wave the slow wave experiences a continuous energy increase. As such, the slow

wave may transfer its energy to the medium at later times, maintaining a continuous heating

mechanism at the neighbourhood of a magnetic null-point.

Influence of a thermal bath on the transport properties

of an open molecular junction

Amir Eskandari-asl

In a molecular junction (MJ) which connects two electrical leads, electron-phonon coupling has

significant effects on the transport properties. However, the MJ is not thermally isolated and the

phonons can be coupled to another thermal bath. For strong enough couplings, the bath thermalizes

phonons on the MJ so that their number would be bias independent. However, in medium and weak

coupling regimes, the number of phonons created in MJ depends on the bias voltage. Obtaining the

master equation (ME) for this system and comparing the results with the case where we have no such

thermal bath, we show that if the bath temperature is greater than the leads, at low bias voltages (where

in the absence of the thermal bath the probability of phonon excitation is low), the thermal bath heats

up our MJ and decreases electronic current. On the other hand, at high bias voltages the bath cools

down MJ and increases the current. However, if the bath temperature is less than the leads, it always

increases the current and the heat flows from the junction to the leads.

P12

P17


10

Reducing the entropic uncertainty lower bound

in the presence of quantum memory via LOCC

Farzin Adabi, Soroush Haseli, Shahryar Salimi

The uncertainty principle sets a lower bound on the uncertainties of two incompatible observables

measured on a particle. The uncertainty lower bound can be reduced by considering a particle as a

quantum memory entangled with the measured particle. In this paper, we consider a tripartite scenario

in which a quantum state has been shared among Alice, Bob, and Charlie. The aim of Bob and Charlie

is to minimize Charlie’s lower bound about Alice’s measurement outcomes. To this aim, they

concentrate their correlation with Alice in Charlie’s side via a cooperative strategy based on local

operations and classical communication. We obtain a lower bound for Charlie’s uncertainty about

Alice’s measurement outcomes after concentrating information and compare it with the lower bound

without concentrating information in some examples. We also provide a physical interpretation of the

entropic uncertainty lower bound based on the dense coding capacity.

Effects of a cloud of strings on the extended phase space

of Einstein–Gauss–Bonnet AdS black holes

Hossein Ghaffarnejad, Emad Yaraie

In this paper we study the thermodynamics of Einstein–Gauss–Bonnet (EGB)-AdS black holes

minimally coupled to a cloud of strings in an extended phase space where the cosmological constant is

treated as pressure of the black holes and its conjugate variable is the thermodynamical volume of the

black holes. To investigate the analogy between EGB black holes surrounded by a cloud of strings and

liquid-gas system we derive the analytical solutions of the critical points and probe the effects of a

cloud of strings on criticality. There is obtained resemblance between “small black hole/large black

hole” (SBH/LBH) phase transition and the liquid-gas phase transition. We see that impact of a cloud of

strings can bring Van der Waals-like behavior, in absence of the Gauss–Bonnet (GB) counterpart. In

the other words, in the EGB black hole with and when it is surrounded by a cloud of strings the

Hawking–Page phase transition would be disappeared and SBH/LBH phase transition recovers. Also

there is not happened Joule–Thomson effect.

P19

P23


11

Theoretical study of equilibrium and

nonequilibrium exciton dynamics in disordered semiconductors

Mehdi Ansari-Rad, Stavros Athanasopoulos

We develop a temperature-dependent theory for singlet exciton hopping transport in disordered

semiconductors. It draws on the transport level concept within a Förster transfer model and bridges the

gap in describing the transition from equilibrium to nonequilibrium time-dependent spectral

diffusion.We test the validity range of the developed model using kinetic Monte Carlo simulations and

find agreement over a broad range of temperatures.It reproduces the scaling of the diffusion length and

spectral shift with the dimensionless disorder parameter and describes in a unified manner the transition

from equilibrium to nonequilibrium transport regime. We find that the diffusion length in the

nonequilibrium regime does not scale with the third power of the Förster radius.The developed theory

provides a powerful tool for interpreting time-resolved and steady state spectroscopy experiments in a

variety of disordered materials, including organic semiconductors and colloidal quantum dots.

Development of a virtual cell model to predict cell response

to substrate topography

Tiam Heydari, Maziar Heidari, Omid Mashinchian, Michal Wojcik, Ke Xu, Matthew John

Dalby, Morteza Mahmoudi, Mohammad Reza Ejtehadi

Cells can sense and respond to changes in the topographical, chemical, and mechanical information in

their environment. Engineered substrates are increasingly being developed that exploit these physical

attributes to direct cell responses (most notably mesenchymal stem cells) and therefore control cell

behavior toward desired applications. However, there are very few methods available for robust and

accurate modeling that can predict cell behavior prior to experimental evaluations, and this typically

means that many cell test iterations are needed to identify best material features. Here, we developed a

unifying computational framework to create a multicomponent cell model, called the “virtual cell

model” that has the capability to predict changes in whole cell and cell nucleus characteristics (in terms

of shape, direction, and even chromatin conformation) on a range of cell substrates. Modeling data

were correlated with cell culture experimental outcomes in order to confirm the applicability of the

virtual cell model and demonstrating the ability to reflect the qualitative behavior of mesenchymal stem

cells. This may provide a reliable, efficient, and fast high-throughput approach for the development of

optimized substrates for a broad range of cellular applications including stem cell differentiation.

P25

P28


12

DNA Molecule Bridge between Metal Electrodes for High-Performance Molecular

Transistor: An Environmental Dependent Approach

Samira Fathizadeh, Sohrab Behnia, Javid Ziaei

Molecule-based transistors have attracted much attention due to their exclusive properties. Creation of

a molecular transistor as well as engineering its structure have become one of the greatest aims of

scientists. We have focused on the environmental dependent behavior of a DNA-templated transistor.

Using the statistical distribution of the energy levels, we were able to distinguish the delocalized states

of charge carriers and the transition between the localized and delocalized behaviors. On the other

hand, we can determine the stability conditions of our quantum dynamical system. The results are

verified by the inverse participation ratio method. Therefore, the most appropriate parameters for

designing the DNA transistor are chosen. The DNA sequence is an important factor for its transport

properties, but the results have shown that in the presence of the bath, the bath parameters are

important, too. As is shown, it is possible that via the adjustment of bath parameters, one can design a

conductivity channel for all nucleotide contents. Thus, one can engineer a DNA based transistor simply

through the setting of only one parameter

Witness for initial correlations among environments

F. T. Tabesh, S. Salimi, A. S. Khorashad

A quantum system inevitably interacts with its surroundings. In general, one does not have detailed

information on an environment. Identifying the environmental features can help us to control the

environment and its effects on the dynamics of an open system. Here, we consider a tripartite system

and introduce a witness for the initial correlations among environments by means of the concept of the

trace distance. Due to the existence of the initial environmental correlations, a tight upper bound is

obtained for the growth of the trace distance of open quantum system states. Therefore, the initial

correlations among the environments subject to particular conditions can be detected by measurements

on the open system.

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Radial carpet beams: A class of nondiffracting,

accelerating, and self-healing beams

Saifollah Rasouli, Ali Mohammad Khazaei, Davud Hebri

Self-accelerating shape-invariant beams are attracting major attention, presenting applications in many

areas such as laser manipulation and patterning, light-sheet microscopy, and plasma channels.

Moreover, optical lattices are offeringmany applications, including quantum computation, quantum

phase transition, spin-exchange interaction, and realization of magnetic fields. We report observation of

a class of accelerating and self-healing beams which covers the features required by all the

aforementioned applications. These beams are accelerating, shape invariant, and self-healing for more

than several tens of meters, have numerous phase anomalies and unprecedented patterns, and can be

feasibly tuned. Diffraction of a planewave from radial phase gratings generates such beams, and due to

their beauty and structural complexity we have called them “carpet” beams. By tuning the value of

phase variations over the grating, the resulting carpet patterns are converted into two-dimensional

optical lattices with polar symmetry. Furthermore, the number of spokes in the radial grating, phase

variation amplitude, and wavelength of the impinging light beam can also be adjusted to obtain

additional features. We believe thatradial carpet beams and lattices might find more applications in

optical micromanipulation, optical lithography,super-resolution imaging, lighting design, optical

communication through atmosphere, etc.

Application of Fresnel diffraction from a phase step to determination

of the spectral line profile

Khosrow Hassani, Ameneh Jabbari, Mohammad Taghi Tavassoly

Determination of the spectral profile of light signals is an effective way to characterize the structure

and dynamics of materials, and also light sources. In this work we introduce a simple, fast, and cost

effective line fitting technique, in which Fresnel diffraction from a phase step is used to determine the

central wavelength and linewidth of the spectra of light sources. In principle, a single diffraction

pattern suffices to determine the line profile. As proof-of-principle examples, two Light Emitting Diode

(LED) sources have been investigated using phase steps with different heights. Reproducible results are

obtained with relative uncertainties in the order of $10^{-2}$ for both the central wavelength and

linewidth. Comparison with conventional spectroscopy measurements are also provided.

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Superlubricity controlled by the multiatomic nature of nanocontacts

Ali Sadeghi

Within the context of dry friction, the ultralow friction regime has been reported at various atomically

small contacts. Realization of large superlubric contacts under ordinary environmental conditions

would greatly impact daily life and technology. Here, we focus on the multiatomic nature of a finite-

size nanoparticle sliding on an atomically clean surface. The particle is subject to an effective field

propagated by the surface and intermediated by the contact layer of the particle. The structural

parameters, including the size, rigidity, and atomic configuration of the contact layer are taken into

account to study the friction of the sliding nanoparticle. Several collective features show up once the

particle contact layer is incommensurate with the surface potential, and the intralayer atomic coupling

is strong. For a rigid layer, a considerable reduction of the friction is predicted at some particular sizes.

In addition to these superlubric sizes that are determined by the lattice mismatch ratio only, enhancing

the multiatomic feature by increasing the layer size and/or the intralayer coupling strength results in a

friction reduction, which is essentially exponential for different values of the normal load (represented

by the interaction amplitude). The latter kind of superlubricity is attributed to the increase of the

number and synchronization of the intermediate slips of individual atoms in the contact layer that

prevents the formation of high potential barriers. The edge atoms, on the other hand, are shown to be

determinant in increasing the friction when they refuse to contribute to the collective slips.

Astrophysical S-factor of the 3He(alpha, gamma)7Be reaction

in the Big-Bang nucleosynthesis

Motahareh Ghamary, Hossein Sadeghi, Saeed Mohammadi

In the present work, we have studied properties of the (_2^3)He (α,γ) (_4^7)Be reaction. The direct

radiative capture nuclear reactions in the Big-Bang nucleosynthesis mainly, are done in the external

areas of inter-nuclear interaction range and play an essential role in nuclear astrophysics. Among of

these reactions, the (_2^3)He (α,γ) (_4^7)Be reaction with Q=1.586MeV is the main part of the Big-

Bang nucleosynthesis chain reactions. This reaction can be used to understand the physical and

chemical properties of the sun as well as can be justified the lake of the observed solar neutrino in the

detector of the Earth. Since product neutrino fluxes are predicated in the center of the sun by the decay

of 7Be and 8B, and almost are proportional to astrophysical S-factor for the (_2^3)He (α,γ) (_4^7)Be

reaction, S34. The (_2^3)He (α,γ) (_4^7)Be reaction is considered the key to solve the solar neutrino

puzzle. Finally, we have astrophysical S-factor obtained for the ground S1,3/2-, first excited S1,1/2-and

total S34 states by modern nucleon-nucleon two-body local potential models. We have also compared

the obtained S-factor with experimental data and other theoretical works.

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Optoelectronic properties of defective MoS2 and WS2 monolayers

Saboura Salehi, Alireza Saffarzadeh

Two-dimensional (2D) transition-metal dichalcogenides (TMD) such as MoS2 and WS2 have some

important and interesting properties, which have attracted considerable theoretical and experimental

attentions. Point defects such as atomic vacancies may cause a large variation in the electronic and

optical properties of layered TMDs. In this paper, the effect of metal and disulphur vacancies on

electronic and optical properties of MoS2 and WS2 monolayers is studied by means of Slater-Koster

tight-binding model and including the spin-orbit coupling. Our results show that the vacancy defects

mainly induce localized states within the bandgap of pristine MoS2 and WS2, leading to a shift of the

Fermi level toward valance band, indicating that both types of vacancies may act as acceptor sites. We

have shown that the localized states in the band gap strongly affect the joint density of states and

optical properties of the pristine monolayers of these materials. The optical spectra of MoS2 and WS2

monolayers show step-like features corresponding to the transition from spin split valence band to the

conduction band minimum. We find that Mo and W vacancies contribute mostly in the low-energy

optical spectrum, while the S2 vacancies enhance the optical conductivity mainly in the visible range of

the spectrum. This suggests that depending on the type of vacancy, the atomic defects in MoS2 and

WS2 monolayers may increase the efficiency of solar cells used in photovoltaic systems.

Higher order corrections to asymptotic-de Sitter inflation

M. Mohsenzadeh, E. Yusofi

Since trans-Planckian considerations can be associated with the re-definition of the initial vacuum, we

investigate further the influence of trans-Planckian physics on the spectra produced by the initial quasi-

de Sitter (dS) state during inflation. We use the asymptotic-dS mode to study the trans-Planckian

correction of the power spectrum to the quasi-dS inflation. The obtained spectra consist of higher order

corrections associated with the type of geometry and harmonic terms sensitive to the fluctuations of

space-time (or gravitational waves) during inflation. As an important result, the amplitude of the power

spectrum is dependent on the choice of c, i.e. the type of space-time in the period of inflation. Also, the

results are always valid for any asymptotic dS space-time and particularly coincide with the

conventional results for dS and flat space-time.

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Gravitational Grating

Sohrab Rahvar

In this work, we study the interaction of the electromagnetic wave (EW) from a distant quasar with the

gravitational wave (GW) sourced by the binary stars. While in the regime of geometric optics the light

bending due to this interaction is negligible, we show that the phase shifting on the wavefront of an EW

can produce the diffraction pattern on the observer plane. The diffraction of the light (with the

wavelength of λe) by the gravitational wave playing the role of gravitational grating (with the

wavelength of λg) has the diffraction angle of Δβ ∼ λe/λg. The relative motion of the observer, the

source of gravitational wave, and the quasar results in a relative motion of the observer through the

interference pattern on the observer plane. The consequence of this fringe crossing is the modulation in

the light curve of a quasar with the period of few hours in the microwave wavelength. The optical

depth for the observation of this phenomenon for a quasar with the multiple images strongly lensed by

a galaxy where the light trajectory of some of the images crosses the lensing galaxy is τ ≃ 0.2. By

shifting the time delay of the light curves of the multiple images in a strong-lensed quasar and

removing the intrinsic variations of a quasar, our desired signals as a new method for detection of

GWs, can be detected.

Micro- and nanostructures formation on glass surface

with different parameters of excimer laser irradiation

Somayeh Panahibakhsh,Saeid Jelvani, Mohammad Jaberi

We present the formation of micro- and nanostructures on glass surfaces by 15-ns 193-nm ArF laser

irradiation during the laser irradiation. The effect of laser fluence and pulse number on the micro- and

nanostructure formation is studied. The scanning electron microscopy images of the irradiated surfaces

show that the shape and density of the microstructures change with different laser parameters. Our

results show that the microstructure formation is a characteristic feature of the ablation threshold of the

glass surface at 15-ns ArF laser irradiation. The ordered microstructures are obtained with 500 pulses at

350 mJ / cm2 laser fluence. Also, the nanostructures can be formed at subthreshold laser fluence. The

micro-Raman analysis of the glass surfaces before and after the laser irradiation shows that no phase

change has occurred during surface structuring. The obtained compact and ordered micro- and

nanostructures or multiscale structured surface can be applied in photonics and surface science.

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Dual correspondence between quantum CSS states and classical spin models

Mohammad Hossein Zarei, Afshin Montakhab

The correspondence between classical spin models and quantum states has attracted much attention in

recent years. However, it remains an open problem as to which specific spin model a given (well-

known) quantum state maps. Here, we provide such an explicit correspondence for an important class

of quantum states where a duality relation is proved between classical spin models and quantum

Calderbank-Shor-Steane (CSS) states. In particular, we employ graph-theoretic methods to prove that

the partition function of a classical spin model on a hypergraph H is equal to the inner product of a

product state with a quantum CSS state on a dual hypergraph $\tild{H}$ . We next use this dual

correspondence to prove that the critical behavior of the classical system corresponds to a relative

stability of the corresponding CSS state to bit-flip (or phase-flip) noise, thus called critical stability. We

finally conjecture that such critical stability is related to the topological order in quantum CSS states,

thus providing a possible practical characterization of such states.

Effects of dielectric inhomogeneity on electrostatic twist rigidity

of a helical biomolecule in Debye-Huckel regime

Amir Rezaie-Dereshgia, Farshid Mohammad-Rafiee

The electrostatic interactions play a crucial role in biological systems. Here we consider an

impermeable dielectric molecule in the solvent with a different dielectric constant. The electrostatic

free energy in the problem is studied in the Debye-Huckel regime using the analytical Green function

that is calculated in the paper. Using this electrostatic free energy, we study the electrostatic

contribution to the twist rigidity of a double stranded helical molecule such as a DNA and an actin

filament. The dependence of the electrostatic twist rigidity of the molecule to the dielectric

inhomogeneity, structural parameters, and the salt concentration is studied. It is shown that, depending

on the parameters, the electrostatic twist rigidity could be positive or negative.

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Analog quantum simulation of extremely sub-Ohmic spin-boson models

Mehdi Abdi, Martin B. Plenio

We propose a scheme for the quantum simulation of sub-Ohmic spin-boson models by color centers in

free- standing hexagonal boron nitride (hBN) membranes. The electronic spin of a color center that

couples to the membrane vibrational spectrum constitutes the physical model. The spin-motion

coupling is provided by an external magnetic field gradient. In this Rapid Communication, we show

that a class of spectral densities can be attained by engineering geometry and boundary conditions of

the hBN resonator. We then put our focus on two extreme cases, i.e., 1/f - and white-noise spectral

densities. Spin coherence and polarization dynamics are studied. Our calculations show coherence

revivals at periods set by the bath characteristic frequency signaling the non-Markovian nature of the

baths. The nonequilibrium dynamics of the spin polarization exhibits a coherent localization, a property

peculiar to the quantum phase transition in extremely sub-Ohmic spin-boson models. Our scheme may

find application in understanding the sources of decoherence in solid-state quantum bits.

Monthly and seasonal variations of aerosol optical properties

and direct radiative forcing over Zanjan, Iran

Maryam Gharibzadeh, aKhan Alam, Yousefali Abedini, Abbasali AliakbariBidokhti,

Amir Masoumi

Aerosol optical properties and radiative forcing over Zanjan in northwest of Iran has been analyzed

during 2010–2013. The aerosol optical and radiative properties are less studied over Zanjan, and

therefore, require a careful and in depth analysis. The optical properties like Aerosol Optical Depth

(AOD), Ångström Exponent (AE), ASYmmetry parameter (ASY), Single Scattering Albedo (SSA),

and Aerosol Volume Size Distribution (AVSD) have been evaluated using the ground-based AErosol

RObotic NETwork (AERONET) data. Higher AOD while relatively lower AE were observed in the

spring and summer, which showed the presence of coarse mode particles in these seasons. An obvious

increase of coarse mode particles in AVSD distribution, as well as a higher value of SSA represented

considerable addition of coarse mode particles like dust into the atmosphere of Zanjan in these two

seasons. Increase in AE, while a decrease in AOD was detected in the winter and fall. The presence of

fine particles indicates the dominance of particles like urban-industrial aerosols from local sources

especially in the winter. The Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART)

model was utilized to calculate the Aerosol Radiative Forcing (ARF) at the Top of the Atmosphere

(TOA), earths surface and within the atmosphere. The annual averaged ARF values were −13.47 W

m−2 and −36.1 W m−2 at the TOA and earths surface, respectively, which indicate a significant

cooling effect. Likewise, the ARF efficiencies at the TOA and earths surface were −65.08 W m−2 and

−158.43 W m−2, respectively. The annual mean atmospheric ARF and heating rate within the

atmosphere were 22.63 W m−2 and 0.27 Kday−1 respectively, represented the warming effect within

the atmosphere. Finally, a good agreement was found between AERONET retrieved ARF and

SBDART simulated ARF.

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Reexamination of strong subadditivity: A quantum-correlation approach

Razieh Taghiabadi, Seyed Javad Akhtarshenas, Mohsen Sarbishaei

The strong subadditivity inequality of von Neumann entropy relates the entropy of subsystems of a

tripartite state ρABC to that of the composite system. Here, we define T(a)(ρABC) as the extent to

which ρABC fails to satisfy the strong subadditivity inequality S(ρB)+S(ρC) <= S(ρAB)+S(ρAC)

with equality and investigate its properties. In particular, by introducing auxiliary subsystem E, we

consider any purification |ψABCE> of ρABC and formulate T(a)(ρABC) as the extent to which the

bipartite quantum correlations of ρAB and ρAC, measured by entanglement of formation and quantum

discord, change under the transformation B → BE and C → CE. Invariance of quantum correlations of

ρAB and ρAC under such transformation is shown to be a necessary and sufficient condition for

vanishing T(a)(ρABC). Our approach allows one to characterize, intuitively, the structure of states for

which the strong subadditivity is saturated. Moreover, along with providing a conservation law for

quantum correlations of states for which the strong subadditivity in equality is satisfied with equality,

we find that such states coincide with those that the Koashi-Winter monogamy relation is saturated.

Boundary-induced coherence in the staggered quantum walk

on different topologies

J. Khatibi Moqadam, A. T. Rezakhani

The staggered quantum walk is a type of discrete-time quantum-walk model without a coin which can

be generated on a graph using particular partitions of the graph nodes. We design Hamiltonians for

potential realization of the staggered dynamics on a two-dimensional lattice composed of

superconducting microwave resonators connected with tunable couplings. The naive generalization of

the one-dimensional staggered dynamics generates two uncoupled one-dimensional quantum walks;

thus more complex partitions need to be employed. However, by analyzing the coherence of the

dynamics, we show that the quantumness of the evolution corresponding to two independent one-

dimensional quantum walks can be elevated to the level of a single two-dimensional quantum walk,

only by modifying the boundary conditions. In fact, by changing the lattice boundary conditions (or

topology), we explore the walk on different surfaces such as a torus, a Klein bottle, a real projective

plane, and a sphere. The coherence and the entropy reach different levels depending on the topology of

the surface. We observe that the entropy captures similar information as coherence; thus we use it to

explore the effects of boundaries on the dynamics of the continuous-time quantum walk and the

classical random walk.

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Effects of low-dimensional material channels

on energy consumption of nano-devices

Zahra Shomali, Reza Asgari

It is commonly believed that the significant energy saving advantages are belonged to the logic circuits

which operate at low temperature as less energy is needed for cooling them to the threshold

temperature after operation. Also, nanoscale thermal management, efficient energy usage in nanoscale

and especially thermal optimization are the most challenging issues, while dealing with the new

generation of transistors as the miniaturizing unlimitedly the silicon channels of the transistors has

resulted in an increase in the energy consumption of computers and the leakage currents. In this paper,

the non-Fourier thermal attitudes of well-known two-dimensional crystalline materials of graphene,

blue phosphorene, germanene, silicene and MoS2 as the silicon channels replacements are studied by

using the phonon Monte-Carlo method. We show that graphene and blue phosphorene have the least

maximum temperature, representor of the reliability of the transistors, among the all five investigated

nano-channels during the Monte-Carlo simulation. The established hotspots of these two materials are

always cooler, not reaching the temperature threshold level, and they lose the heat much faster as the

heat generation zone is switched off. The obtained results considered along with the electrical

disadvantages of the graphene layer, suggests the blue phosphorene as the more thermally appropriate

and optimal choice for the silicon channel replacement in new designed field effect transistors. That is

to say that the limit of the energy and economic cost of the producing the advanced blue phosphorene

chips meets the value of the product for the computing enterprise.

Understanding the emergence of modern humans and the disappearance of

Neanderthals: Insights from Kaldar Cave

(Khorramabad Valley, Western Iran)

Behrouz Bazgir, Andreu Ollé, Laxmi Tumung, Lorena Becerra-Valdivia, Katerina Douka,

Thomas Higham, Jan van der Made, Andrea Picin, Palmira Saladié, Juan Manuel López-García,

Hugues-Alexandre Blain, Ethel Allué, Mónica Fernández-García, Iván Rey-Rodríguez, Diego

Arceredillo, Faranak Bahrololoumi, Moloudsadat Azimi, Marcel Otte, Eudald Carbonell

Kaldar Cave is a key archaeological site that provides evidence of the Middle to Upper Palaeolithic

transition in Iran. Excavations at the site in 2014–2015 led to the discovery of cultural remains

generally associated with anatomically modern humans (AMHs) and evidence of a probable

Neanderthal-made industry in the basal layers. Attempts have been made to establish a chronology for

the site. These include four thermoluminescence (TL) dates for Layer 4, ranging from 23,100 ± 3300 to

29,400 ± 2300 BP, and three AMS radiocarbon dates from charcoal samples belonging to the lower part

of the same layer, yielding ages of 38,650–36,750 cal BP, 44,200–42,350 cal BP, and 54,400–

46,050 cal BP (all at the 95.4% confidence level). Kaldar Cave is the first well-stratified Late

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Palaeolithic locality to be excavated in the Zagros which is one of the earliest sites with cultural

materials attributed to early AMHs in western Asia. It also offers an opportunity to study the

technological differences between the Mousterian and the first Upper Palaeolithic lithic technologies as

well as the human behaviour in the region. In this study, we present a detailed description of the newly

excavated stratigraphy, quantified results from the lithic assemblages, preliminary faunal remains

analyses, geochronologic data, taphonomic aspects, and an interpretation of the regional

paleoenvironment.

The integrated Sachs–Wolfe effect in the bulk viscous dark energy model

B. Mostaghel, H. Moshafi, S. M. S. Movahed

We examine linear perturbation theory to evaluate the contribution of viscosity coefficient in the

growing of dark matter perturbations in the context of the bulk viscous dark energy model inspired by

thermodynamical dissipative phenomena proposed by Mostaghel, Moshafi, and Movahed. As the

cosmological implementations, we investigate the Integrated Sachs–Wolfe (ISW) autopower spectrum,

the ISW-galaxy cross-power spectrum and derive limits on fσ8. The dimension-less bulk viscosity

coefficient (γ) in the absence of interaction between dark sectors, modifies the Hubble parameter and

the growth function, while the Poisson equation remains unchanged. Increasing γ reduces the dark

matter growing mode at the early epoch while a considerable enhancement will be achieved at the late

time. This behaviour imposes non-monotonic variation in the time evolution of gravitational potential

generating a unique signature on the cosmic microwave background radiation photons. The bulk

viscous dark energy model leads to almost a decreasing in ISW source function at the late time.

Implementation of the redshift space distortion observations based on ‘Gold-2017’ catalogue, shows

Ω0m=0.303+0.044−0.038 , γ=0.033+0.098−0.033 , and σ8=0.769+0.080−0.089 at 1σ level of

confidence. Finally, tension in the σ8 is alleviated in our viscous dark energy model.

Quasi-periodic and irregular motion of a solid sphere falling through

a thixotropic yield-stress fluid

Mina Fazilati, Nahid Maleki-Jirsaraei, Shahin Rouhani, Daniel Bonn

We report the observation of the oscillatory and irregular motion of solid spheres settling under the

influence of gravity in a thixotropic yield-stress fluid: namely, a suspension of Laponite. The size of the

ball and the aging time of the Laponite suspension are shown found to be two important parameters

that determine whether oscillations occur or not. The irregular motion may be related to the existence

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of an unstable flow region and shear banding as is concluded from comparisons with rheological

measurements, namely, the flow curve and the creep tests, using on the same Laponite suspensions.

Spin-isospin effects on Isgur-Wise function for heavy-baryon transitions

Z. Sharifi, A. Bayat, M. Hamzavi, M. Bigdeli

In this paper, the baryonic wave function has been obtained with the Cornell potential, a combination

of linear and Coulomb terms, using the hyper-radial Schrödinger equation and an improved variational

method while on the other hand, hyperfine interactions are considered, including smeared standard

hyperfine term, isospin dependent and spin–isospin dependent terms in order to improve the results.

Then, the baryonic Isgur–Wise function in hyperspherical coordinates has been investigated employing

both mentioned wave functions. Finally, in particular, the charged radius and the decay width of

transition have been reported for both methods and compared with those obtained in experiments or

theories.

A Multiscale pipeline for the search of string-induced CMB anisotropies

A. Vafaei Sadr, S. M. S. Movahed, M. Farhang, C. Ringeval, F. R. Bouchet

We propose a multiscale edge-detection algorithm to search for the Gott–Kaiser–Stebbins imprints of a

cosmic string (CS) network on the cosmic microwave background (CMB) anisotropies. Curvelet

decomposition and extended Canny algorithm are used to enhance the string detectability. Various

statistical tools are then applied to quantify the deviation of CMB maps having a CS contribution with

respect to pure Gaussian anisotropies of inflationary origin. These statistical measures include the one-

point probability density function, the weighted two-point correlation function (TPCF) of the

anisotropies, the unweighted TPCF of the peaks and of the up-crossing map, as well as their cross-

correlation. We use this algorithm on a hundred of simulated Nambu–Goto CMB flat sky maps,

covering approximately 10 per cent of the sky, and for different string tensions Gμ. On noiseless sky

maps with an angular resolution of 0.9 arcmin, we show that our pipeline detects CSs with Gμ as low

as Gμ ≳ 4.3 × 10^{−10}. At the same resolution, but with a noise level typical to a CMB-S4 phase II

experiment, the detection threshold would be to Gμ ≳ 1.2 × 10^{−7}.

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Multifractal Analysis of Pulsar Timing Residuals: Assessment

of Gravitational Wave Detection

I. Eghdami , H. Panahi , S. M. S. Movahed

We introduce a pipeline including multifractal detrended cross-correlation analysis (MF-DXA)

modified by either singular value decomposition or the adaptive method to examine the statistical

properties of the pulsar timing residual (PTR) induced by a gravitational wave (GW) signal. We

propose a new algorithm, the so-called irregular MF-DXA, to deal with irregular data sampling.

Inspired by the quadrupolar nature of the spatial cross-correlation function of a gravitational wave

background (GWB), a new cross-correlation function, $\sigma_times$, derived from irregular MF-

DXA will be introduced. We show that this measure reveals the quadrupolar signature in the PTRs

induced by stochastic GWB.

We propose four strategies based on the y-intercept of fluctuation functions, the generalized Hurst

exponent, and the width of the singularity spectrum to determine the dimensionless amplitude and

power-law exponent of the characteristic strain spectrum as $\mathcal{H}_{c}(f)~

\mathcal{A}_{yr}(f/f_{yr})^\zeta$ for stochastic GWB. Using the value of the Hurst exponent, one

can clarify the type of GWs. We apply our pipeline to explore 20 ms pulsars observed by the Parkes

Pulsar Timing Array. The computed scaling exponents confirm that all data are classified into a

nonstationary class implying the universality feature. The value of the Hurst exponent is in the range

[0.56, 0.87]. The q-dependency of the generalized Hurst exponent demonstrates that the observed PTRs

have multifractal behavior, and the source of this multifractality is mainly attributed to the correlation

of data, which is another universality of the observed data sets.Multifractal analysis of available PTR

data sets reveals an upper bound on the dimensionless amplitude of the GWB,

$\mathcal{A}_{yr}<2.0 \times 10^{-15}$.

Cosmic string detection with tree-based machine learning

A. Vafaei Sadr, M. Farhang, S. M. S. Movahed, B. Bassett, M. Kunz

We explore the use of random forest and gradient boosting, two powerful tree-based machine learning

algorithms, for the detection of cosmic strings in maps of the cosmic microwave background (CMB),

through their unique Gott–Kaiser–Stebbins effect on the temperature anisotropies. The information in

the maps is compressed into feature vectors before being passed to the learning units. The feature

vectors contain various statistical measures of the processed CMB maps that boost cosmic string

detectability. Our proposed classifiers, after training, give results similar to or better than claimed

detectability levels from other methods for string tension, Gμ. They can make 3σ detection of strings

with Gμ ≳ 2.1 × 10−10 for noise-free, 0.9′-resolution CMB observations. The minimum detectable

tension increases to Gμ ≳ 3.0 × 10−8 for a more realistic, CMB S4-like (II) strategy, improving over

previous results.

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Optical absorption properties of few-layer phosphorene

Zahra Torbatian, Reza Asgari

We investigate the optical absorption and transmission of few-layer phosphorene in the framework of

ab initio density functional simulations and many-body perturbation theory at the level of random-

phase approximation. In bilayer phosphorene, the optical transition of the valence band to the

conduction band appears along the armchair direction at about 0.72 eV, while it is absent along the

zigzag direction. This phenomenon is consistent with experimental observations. The angle-resolved

optical absorption in few-layer phosphorene shows that it is transparent when illuminated by near-

grazing incidence of light. Also, there is a general trend of an increase in the absorption by increasing

the number of layers. Our results show that the bilayer phosphorene exhibits greater absorbance

compared to that of bilayer graphene in the ultraviolet region. Moreover, the maximal peak in the

calculated absorption of bilayer MoS2 is in the visible region, while bilayer graphene and phosphorene

are transparent. In addition, the collective electronic excitations of few-layer phosphorene are explored.

An optical mode (in-phase mode) that follows a low-energy √q dependence for all structures and

another which is a damped acoustic mode (out-of-phase mode) with linear dispersion for multilayer

phosphorene are obtained. The anisotropy of the band structure of few-layer phosphorene along the

armchair and zigzag directions is manifested in the collective plasmon excitations.

Multi-kink collisions in the φ6 model

Aliakbar Moradi Marjaneh, Vakhid A. Gani, Danial Saadatmand, Sergey V. Dmitriev, Kurosh

Javidan

We study simultaneous collisions of two, three, and four kinks and antikinks of the ϕ 6 model at the

same spatial point. Unlike the ϕ 4 kinks, the ϕ 6 kinks are asymmetric and this enriches the variety of

the collision scenarios. In our numerical simulations we observe both reflection and bound state

formation depending on the number of kinks and on their spatial ordering in the initial configuration.

We also analyze the extreme values of the energy densities and the field gradient observed during the

collisions. Our results suggest that very high energy densities can be produced in multi-kink collisions

in a controllable manner. Appearance of high energy density spots in multi-kink collisions can be

important in various physical applications of the Klein-Gordon model.

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Investigating multicolour photochromic behaviour of AgCl and AgI

thin films loaded with silver nanoparticles

Razieh Talebi

Multicolour photochromic behaviour in light-sensitive Ag–AgCl and Ag–AgI thin films at room

temperature was investigated and compared. Although it seemed that the Ag–Ag halide thin films have

similar optical properties, their optical responses to a monochromatic laser beam are completely

different. It is shown that Ag–AgCl thin film changes its colour under light irradiation to the same

colour of the incident light, regardless of the polarization state of the laser beam. In contrast, the Ag–

AgI thin film changes to complementary colours of the incident beam. The different optical behaviours

of Ag–AgCl and Ag–AgI thin films are due to the different electrical properties of AgCl and AgI thin

films. Moreover, the multicolour photochromic behaviour is due to the changes of absorption spectra

and surface morphology of silver nanoparticles on silver-haide thin film. These changes are the result

of excitation of localized surface plasmon resonance of silver nanoparticles by the laser beam and

charge transfer between silver nanoparticles and silver-halide thin films.

Anyonic self-induced disorder in a stabilizer code:

Quasi many-body localization in a translational invariant model

H. Yarloo, A. Langari, A. Vaezi

We enquire into the quasi many-body localization in topologically ordered states of matter, revolving

around the case of Kitaev toric code on the ladder geometry, where different types of anyonic defects

carry different masses induced by environmental errors. Our study verifies that the presence of anyons

generates a complex energy landscape solely through braiding statistics, which suffices to suppress the

diffusion of defects in such clean, multicomponent anyonic liquid. This nonergodic dynamics suggests

a promising scenario for investigation of quasi many-body localization. Computing standard

diagnostics evidences that a typical initial inhomogeneity of anyons gives birth to a glassy dynamics

with an exponentially diverging time scale of the full relaxation. Our results unveil how self-generated

disorder ameliorates the vulnerability of topological order away from equilibrium. This setting provides

a new platform which paves the way toward impeding logical errors by self-localization of anyons in a

generic, high energy state, originated exclusively in their exotic statistics.

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The LOCV asymmetric nuclear matter two-body

density distributions versus those of FHNC

Azar Tafrihi

The theoretical computations of the electron-nucleus scattering can be improved, by employing the

asymmetric nuclear matter (ASM) two-body density distributions (TBDD). But, due to the

sophistications of the calculations, the T BDD with arbitrary isospin asymmetry have not yet been

computed in the Fermi Hypernetted Chain (FHNC) or the Monte Carlo (MC) approaches. So, in the

present work, we intend to find the ASM TBDD, in the states with isospin T , spin S and spin

projection Sz , in the Lowest Order Constrained Variational (LOCV) method. It is demonstrated that, at

small relative distances, independent of the proton to neutron ratio β, the state-dependent TBDD have a

universal shape. Expectedly, it is observed that, at low (high) β values, the nucleons prefer to make a

pair in the T = 1(0) states. In addition, the strength of the tensor-dependent correlations is investigated,

using the ratio of the TBDD in the TSSz = 010 state with θ = π/2 and that of θ = 0. The mentioned

ratios peak at r ∼ 0.9f m, considering different β values. It is hoped that, the present results could help a

better reproduction of the experimental data of the electron-nucleus scattering.

Interactions between pentagonal truncated pyramids

with homeotropic anchoring in a nematic liquid crystal

Seyed Reza Seyednejad, Mohammad Reza Mozaffari, Takeaki Araki,

Ehsan Nedaaee Oskoee

In this study, we numerically investigate the interactions between pentagonal truncated pyramids in a

nematic liquid crystal host. The colloidal arrangements are investigated by minimizing the Landau-de

Gennes free energy in presence of homeotropic anchoring surface energy upon the particles. We further

explain the interactions using symmetry breaking in the director field and particle-particle relative

arrangements. In the case of long-range separations, interactions exhibit some deviations from those

observed in the case of dipolar symmetry. We also exhibit that, in some cases, decreasing the bending

elastic distortions between two adjacent lateral faces will cause a nonhorizontal side-to-side

configuration. In many-body interactions, we evaluate the ability of the bent and branch configurations

to form complex self-tiling assemblies pentagonal truncated pyramid blocks.

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Computational investigation of isotopic signature of radioxenon released

from Tehran research reactor

Pouneh Tayyebi, Fereydoun Abbasi Davani, Mohsen Tabasi, Marzieh Ebrahimkhani, Hossein

Afarideh

This paper presents the early radioxenon emission inventory for Tehran research reactor (TRR) based

on comparison of the two computational analyses of MCNPX2.6 and ORIGEN 2.1. To determine the

possible xenon isotopic signature of TRR’s releases under normal operational condition, the TRR fresh

fuel burn-up through a total 400 days operational reactor power cycle is simulated. Ratios of the

radioxenon isotopes are calculated as a function of time during an operational cycle. There are 10.55

and 3.37 % differences between the results of these two codes for the calculation of 133Xe and 135Xe

activity, respectively.

Breakthrough in 4π ion emission mechanism understanding

in plasma focus devices

Mehdi Sohrabi, Arefe Zarinshad, Morteza Habibi

Ion emission angular distribution mechanisms in plasma focus devices (PFD) have not yet been well

developed and understood being due to the lack of an efficient wide-angle ion distribution image

detection system to characterize a PFD space in detail. Present belief is that the acceleration of ions

points from “anode top” upwards in forward direction within a small solid angle. A breakthrough is

reported in this study, by mega-size position-sensitive polycarbonate ion image detection systems

invented, on discovery of 4π ion emission from the “anode top” in a PFD space after plasma pinch

instability and radial run-away of ions from the “anode cathodes array” during axial acceleration of

plasma sheaths before the radial phase. These two ion emission source mechanisms behave espectively

as a “Point Ion Source” and a “Line Ion Source” forming “Ion Cathode Shadows” on megasize

detectors. We believe that the inventions and discoveries made here will open new horizons for

advanced ion emission studies towards better mechanisms understanding and in particular will promote

efficient applications of PFDs in medicine, science and technology.

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Quantumness of quantum channels

Fereshte Shahbeigi, Seyed Javad Akhtarshenas

Quantum coherence is a fundamental aspect of quantum physics and plays a central role in quantum

information science. This essential property of the quantum states could be fragile under the influence

of the quantum operations. The extent to which quantum coherence is diminished depends both on the

channel and the incoherent basis. Motivated by this, we propose a measure of nonclassicality of a

quantum channel as the average quantum coherence of the state space after the channel acts on,

minimized over all orthonormal basis sets of the state space. Utilizing the squared $l_1$-norm of

coherence for the qubit channels, the minimization can be treated analytically and the proposed

measure takes a closed form of expression. If we allow the channels to act locally on a maximally

entangled state, the quantum correlation is diminished making the states more classical. We show that

the extent to which quantum correlation is preserved under local action of the channel cannot exceed

the quantumness of the underlying channel. We further apply our measure to the quantum

teleportation protocol and show that a nonzero quantumness for the underlying channel provides a

necessary condition to overcome the best classical protocols.

Longitudinal structure function from logarithmic slopes of F2 at low x

G. R. Boroun

Using Laplace transform techniques, I calculate the longitudinal structure function FL(x,Q2) from the

scaling violations of the proton structure function F2(x,Q2) and make a critical study of this

relationship between the structure functions at leading order (LO) up to next-to-next-to leading order

(NNLO) analysis at small x. Furthermore, I consider heavy quark contributions to the relation between

the structure functions, which leads to compact formula for Nf = 3 + Heavy. The nonlinear corrections

to the longitudinal structure function at LO up to NNLO analysis are shown in the Nf = 4 (light quark

flavor) based on the nonlinear corrections at R = 2 and R = 4 GeV−1. The results are compared with

experimental data of the longitudinal proton structure function FL in the range of 6.5 Q2 800 GeV2

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Frequency-driven bulk-to-surface transition

of conductivity in ZnO nanowires

Mohammad Javadi, Yaser Abdi

The frequency of an applied AC voltage dramatically affects the nature of conductivity in zinc oxide

nanowires. The nanowires exhibit a continuous transition from positive to negative photoconductivity

as a function of the driving frequency with the characteristic transition frequency observed at 48.9 kHz.

In addition, ZnO nanowires display a frequency-driven metal-insulator transition at room temperature,

which appears almost at the same critical frequency. The responsible mechanism for both transitions is

attributed to the switching of conductivity from bulk to surface conduction. A theory is presented

describing the experimental observations. The frequency-driven bulk-to-surface transition of

conductivity is expected to be a generic character for a broad range of semiconductor nanostructures

with the large surface-to-volume ratio.

Thermal effects on coherence and excitation transfer

Laleh Memarzadeh, Azam Mani

To control and utilize quantum features in small scale for practical applications such as quantum

transport, it is crucial to gain a deep understanding of the quantum characteristics of states such as

coherence. Here by introducing a technique that simplifies solving the dynamical equation, we study

the dynamics of coherence in a system of qubits interacting with each other through a common bath at

nonzero temperature. Our results demonstrate that depending on the initial state, the environment

temperature affects coherence and excitation transfer in different ways. We show that when the initial

state is incoherent, as time goes on, coherence and the probability of excitation transfer increase. But

for a coherent initial state, we find a critical value of temperature below which the system loses its

coherence in time, which diminishes the probability of excitation transfer. Hence, in order to achieve a

higher value of coherence and also a higher probability of excitation transfer, the temperature of the

bath should go beyond that critical value. Stationary coherence and the probability of finding excited

qubits in a steady state are discussed. We also elaborate on the dependence of the critical value of the

bath temperature on system size.

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Theoretical Study of the Thermal Distribution in Yb-Doped Double-Clad Fiber

Laser by Considering Different Heat Sources

Maryam Karimi

Thermal effects limit the gain, quality, and stability of the high power fiber lasers and amplifiers. In

this paper, the different values of heat conductive coefficients at the core, the first and second clad with

the complete form of the heat transfer equation is considered. A quartic equation was proposed to

determine the temperature at the fiber laser surface. Using the surface temperature value, the

temperature can be determined at the longitudinal and radial position of the double clad fiber laser. The

different definition of the heat sources which was previously presented in articles used to describe the

heat generation at a double clad high pump power fiber laser condition. The results compared to each

other and the percentage of each factor in heat generation was calculated.

Entropy production due to Lorentz invariance violation

Hosein Mohammadzadeh, Mehrnoosh Farahmand, Mahnaz Maleki

It is generally believed that the concept of the spacetime continuum should be modified for distances as

small as the Planck length. This is a length scale at which the spacetime might have a discrete structure

and quantum gravity effects are dominant. Presumably, the microscopic fluctuations within the

geometry of spacetime should result in an enormous entropy production. In the present work, we look

for the effects of Lorentz invariance violation (LIV) in flat and curved backgrounds that can be

measured by quantum entanglement and quantum thermodynamic entropies for scalar modes. Our

results show that the general behavior of these entropies is the same. We also consider variations of the

entropies with respect to LIV and cosmological and field parameters. Using the properties of these

entropies, along with detecting the most entangled modes, we extract information about the past

existence of LIV, which in turn might be useful in recovering the quantum structure of gravity. Indeed,

the occurrence of a peak in the behavior of these entropies for a specific momentum could provide

information about the expansion parameters. Moreover, information about the LIV parameter is

codified in this peak.

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Improving the soft magnetic properties of the Fe73.5Si13.5B9Nb3Cu1

nanostructured ribbons by annealing in the hydrogen atmosphere

Abolghasem Nourmohammadi, Hamed Mohammadi Fesharaki

The nanocrystallization stage was performed in a reductive hydrogen atmosphere to prevent surface

oxidation and improve the soft magnetic properties of the amorphous, Fe73.5Si13.5B9Nb3Cu1 alloy

through annealing. Both the amorphous and nanocrystalline Fe73.5Si13.5B9Nb3Cu1 ribbons were

characterized by differential scanning calorimetry, transmission electron microscopy, X-ray diffraction,

alternative gradient field magnetometry, and AC susceptometry techniques. To reduce the processing

cost, commercially available industrial gas sources were used at the atmospheric pressure, instead of

high purity inert gas or high vacuum ambient. The surface oxidation completely stopped after using a

70% Ar–30% H2 mixture of such gases, also the period of the nanocrystallization stage decreased.

Moreover, it was observed that the soft magnetic parameters of the nanocrystalline samples depend on

the annealing time. Both the in-plane permeability and coercive field of the ribbons improved through

nanocrystallization and the optimum annealing time was determined.

Butterfly effect in 3D gravity

Mohammad M. Qaemmaqami

We study the butterfly effect by considering shock wave solutions near the horizon of the AdS black

brane in some of 3-dimensional Gravity models including; 3D Einstein Gravity, Minimal Massive 3D

Gravity, New Massive Gravity, Generalized Massive Gravity, Born-Infeld 3D Gravity and New Bi-

Gravity. We calculate the butterfly velocities of these models and also we consider the critical points

and different limits in some of these models. By studying the butterfly effect in the Generalized

Massive Gravity, we observe a correspondence between the butterfly velocities and right-left moving

degrees of freedom or the central charges of the dual 2D Conformal Field Theories.

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Synchronized motion of noncontact rack-and-pinion

devices subject to thermal noise

MirFaez Miri, Zahra Etesami

We study a submicron device composed of one rack and N pinions. The pinions are coupled via the

torsional springs. The rack and pinions have no contact, but are intermeshed via the lateral Casimir

force. We show that even extremely soft torsional springs allow synchronized motion of N pinions. The

total load that the machine lifts up, increases almost linearly with N. The synchronized state blooms

even if the spring constants and the distances between the rack and the pinions are not tuned, and the

thermal noise looms. These results lead one to be optimistic about harnessing the Casimir force at the

nanoscale and the realization of a new generation of nanodevices.

Bandgap reduction of photocatalytic TiO2 nanotube by Cu doping

S. Khajoei Gharaei, M. Abbasnejad, Ryo Maezono

We performed the electronic structure calculations of Cu-doped TiO2 nanotubes by using density

functional theory aided by the Hubbard correction (DFT + U). Relative positions of the sub-bands due

to the dopants in the band diagram are examined to see if they are properly located within the redox

interval. The doping is found to tune the material to be a possible candidate for the photocatalyst by

making the bandgap accommodated within the visible and infrared range of the solar spectrum. Among

several possibilities of the dopant positions, we found that only the case with the dopant located at the

center of nanotube seems preventing from electron-hole recombinations to achieve desired

photocatalytic activity with n-type behavior.

Effect of boron and phosphorus codoping on the electronic and optical properties

of graphitic carbon nitride monolayers: First-principle simulations

Mahdieh Yousefi, Monireh Faraji, Reza Asgari, Alireza Z. Moshfegh

We study the effect of boron (B) and phosphorous (P) doping and B/P codoping on electronic and

optical properties of graphitic carbon nitride (g-C3N4 or GCN) monolayers using density functional

simulations. The energy band structure indicates that the incorporation of both B and P into a

hexagonal lattice of GCN reduces the energy band gap from 3.1 for pristine GCN to 1.9 eV, thus

extending light absorption toward the visible region. Moreover, on the basis of calculating absorption

spectra and dielectric function, the codoped system exhibits an improved absorption intensity in the

visible region and more electronic transitions, which named π ∗ electronic transitions that occurred and

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were prohibited in the pristine GCN. These transitions can be attributed to charge redistribution upon

doping, caused by distorted configurable B/P-codoped GCN confirmed by both electron density and

Mulliken charge population. Therefore, B/P-codoped GCN is expected to be an auspicious candidate to

be used as a promising photoelectrode in photoelectrochemical water splitting reactions leading to

efficient solar H2 production.

The Effect of $\alpha$-Vacua on the Scalar and

Tensor Spectral Indices: Slow-Roll Approximation

H. Bouzari Nezhad, F. Shojai

Since the duration of inflation is finite, imposing the initial condition in infinite past, i.e. the Bunch-

Davies vacuum, is inherently ambiguous. In this paper, we resort to the mixed states as initial condition

which are called the $\alpha$-vacua and then introduce a physical momentum cutoff $\Lambda$

\cite{Danielsson:2002kx}, in which the evolution of perturbations begins. We show that the initial time

$t_i$, when the initial condition is imposed, depends on the wave number of fluctuation, as it is for the

time of horizon crossing, $t_q$. Then we calculate the corrections to the scalar and tensor power

spectra and their corresponding spectral indices. Throughout this work, the calculation is done up to the

first order in slow-roll parameters. We indicate that the leading order corrections to the spectral indices

have a $q$-dependent amplitude,$2\epsilon_{f}[2\epsilon_{f}(\frac{q}{q_{f}})^{4\epsilon+4\eta}-

\eta_ {f}(\frac{q} {q_{f}})^{3\epsilon+\xi}]$ times a $q$-dependent oscillatory part, $\cos

(\frac{2\Lambda(q/q_{f})^{\epsilon}}{H_{f}})$, where $H$, $\epsilon$, $\eta$, and $\xi$ are the

Hubble and slow-roll parameters respectively, and the subscript $f$ denotes that these quantities are

evaluated at the time when the first scale, $q_{f}$, satisfies the initial condition, i.e.

$q=a(t_i)\Lambda$.

On variational principle and canonical structure of gravitational

theory in double-foliation formalism

Sajad Aghapour, Ghadir Jafari, Mehdi Golshani

In this paper, we analyze the variation of the gravitational action on a bounded region of spacetime

whose boundary contains segments with various characters, including null. We develop a systematic

approach to decompose the derivative of metric variations into orthogonal and tangential components

with respect to the boundary and express them in terms of variations of geometric objects associated

with the boundary hypersurface. We suggest that a double-foliation of spacetime provides a natural and

useful set-up for treating the general problem and clarifies the assumptions and results in specialized

ones. In this set-up, we are able to obtain the boundary action necessary for the variational principle to

become well-posed as well as the canonical structure of the theory, while keeping the variations

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completely general. Especially, we show how one can remove the restrictions imposed on the metric

variations in previous works due to the assumption that the boundary character is kept unaltered. As a

result, we find that on null boundaries there exists a new canonical pair related to the change in

character of the boundary. This set-up and the procedure of calculation are stated in a way that can be

applied to other more generalized theories of gravity.

Two-Dimensional Hexagonal Sheet of TiO 2

Hossein Asnaashari Eivari, S. Alireza Ghasemi, Hossein Tahmasbi, Samare Rostami, Somayeh

Faraji, Robabe Rasoulkhani, Stefan Goedecker, Maximilian Amsler

We report the ab initio discovery of a novel putative ground state for quasi two-dimensional TiO 2

through a structural search using the minima hopping method with an artificial neural network

potential. The structure is based on a honeycomb lattice and is energetically lower than the

experimentally reported lepidocrocite sheet by 7 meV/atom and merely 13 meV/atom higher in energy

than the rutile bulk structure. According to our calculations, the hexagonal sheet is stable against

mechanical stress, chemically inert, and can be deposited on various substrates without disrupting the

structure. Its properties differ significantly from all known TiO 2 bulk phases with a large gap of 5.05

eV that can be tuned through strain and defect engineering.

Inter-layer and intra-layer heat transfer in bilayer/monolayer graphene van der

Waals heterostructure: Is there a Kapitza resistance analogous?

Ali Rajabpour; Zheyong Fan; S. Mehdi Vaez Allaei

Van der Waals heterostructures have exhibited interesting physical properties. In this paper, heat

transfer in hybrid coplanar bilayer/monolayer (BL-ML) graphene, as a model layered van der Waals

heterostructure, was studied using non-equilibrium molecular dynamics (MD) simulations. The

temperature profile and inter- and intra-layer heat fluxes of the BL-ML graphene indicated that, there is

no fully developed thermal equilibrium between layers and the drop in the average temperature profile

at the step-like BL-ML interface is not attributable to the effect of Kapitza resistance. By increasing the

length of the system up to 1 μm in the studied MD simulations, the thermally non-equilibrium region

was reduced to a small area near the step-like interface. All MD results were compared to a continuum

model and a good match was observed between the two approaches. Our results provide a useful

understanding of heat transfer in nano- and micro-scale layered materials and van der Waals

heterostructures.

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Folding model analyses of 12C-12C and 16O-16O elastic scattering using

the density-dependent LOCV-averaged effective interaction

M.Rahmat , M.Modarres

The averaged effective two-body interaction (AEI), which can be generated through the lowest order

constrained variational (LOCV) method for symmetric nuclear matter (SNM) with the input [Reid68,

Ann. Phys. 50, 411 (1968)] nucleon-nucleon potential, is used as the effective nucleon-nucleon

potential in the folding model to describe the heavy-ion (HI) elastic scattering cross sections. The

elastic scattering cross sections of 12C-12C and 16O-16O systems are calculated in the above

framework. The results are compared with the corresponding calculations coming from the fitting

procedures with the input finite range DDM3Y 1-Reid potential and the available experimental data at

different incident energies. It is shown that a reasonable description of the elastic 12C-12C and 16O-

16O scattering data at the low and medium energies can be obtained by using the above LOCV AEI,

without any need to define a parametrized density-dependent function in the effective nucleon-nucleon

potential, which is formally considered in the typical DDM3Y 1-Reid interactions.

Inflation by spin and torsion in the Poincare gauge theory of gravity

S. Akhshabi, E. Qorani, F. Khajenabi

In the Poincare gauge theory of gravity, in addition to the mass-energy content, spin is also a source for

gravitational interactions. Although the effects of spin are negligible at low energies, they can play a

crucial role at the very early Universe when the spin density was very high. In this paper by choosing a

suitable Lagrangian for the Poincare gauge theory of gravity, and suitable energy-momentum and spin

density tensors, we show that the effects of spin and torsion can lead to a inflationary phase without the

need for any additional fields. No fine-tuning of parameters is required in this setup. We also calculate

the scalar spectral index at the end of inflation and show that it agrees with the most recent

observational data.

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Magnetic and electric hotspots via fractal clusters

of hollow silicon nanoparticles

Zahra Naeimi, MirFaez Miri

We show that fractal clusters of hollow Si nanoparticles provide both magnetic hotspots (MHs) and

electric hotspots (EHs). The hollow size tailors the wavelength dependence of the field enhancement.

In the wavelength window 400–750 nm, magnetic field intensity enhancements of 10–3790 and electric

field intensity enhancements of 10–400 are achievable. Wavelength-tuned MHs and EHs allow better

enhancement of Raman optical activity, fluorescence and circular dichroism of molecules, and so on. Si

nanoparticles overcome the limitations of metallic ones, which provide only EHs at the price of heat

perturbations on a nearby quantum emitter due to metallic ohmic losses.

On the initial conditions of scalar and tensor fluctuations in f (R, φ) gravity

S. Cheraghchi, F. Shojai

We have considered the perturbation equations governing the growth of fluctuations during inflation in

generalized scalar tensor theory f (R, φ). We have found that the scalar metric perturbations at very

early times are negligible compared to the scalar field perturbation, just like general relativity. At

sufficiently early times, when the physical momentum of perturbation mode, q/a is much larger than

the Hubble parameter H, i.e. q/a >> H, we have obtained the metric and scalar field perturbation

in the form of WKB solutions up to an undetermined coefficient. Then we have quantized the scalar

fluctuations and expanded the metric and the scalar field perturbations with the help of annihilation and

creation operators of the scalar field perturbation. The standard commutation relations of annihilation

and creation operators fix the unknown coefficient.Going over to the gauge invariant quantities which

are conserved beyond the horizon, we have obtained the initial condition of the generalized

Mukhanov–Sasaki equation. Then a similar procedure is performed for the case of tensor metric

perturbation. As an example of the generalized Mukhanov–Sasaki equation and its initial condition, we

have proposed a power-lawfunctional form as f (R, φ) = f_0*R^m*φ^n and obtained an exact

inflationary solution. In this background, then we have discussed how the scalar and tensor fluctuations

grow.

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Confinement of aqueous mixtures of ionic liquids between amorphous TiO2 slit

nanopores: electrostatic field induction

Fatemeh Mohammadpour, Maryam Heydari Dokoohaki, Amin Reza Zolghadr, Mohammad

Hadi Ghatee, Mahmood Moradi

Electrostatic potential in the vicinity of the surface is induced when aqueous mixtures of hydrophobic

and hydrophilic ionic liquids (ILs) are confined between a slit nanopore of amorphous but not

crystalline TiO2 semiconductors. According to our molecular dynamics (MD) simulations, the extent

of ion-pairing lifetime under such nanoscale confinement is substantially lower than its value in the

bulk. It becomes still lower when aqueous mixtures of ionic liquid electrolytes are used. Ion–ion

correlation is broken completely in the confined dilute aqueous electrolyte systems. The anions and

cations of the ILs migrate and accumulate at the opposite amorphous TiO2 electrodes that are separated

by 10 nm to arrange a nanosize pore. In contrast, we have shown that the electrostatic interactions

between the IL ions are dominant when the electrolyte is confined between anatase (101) TiO2. A

similar trend is observed for the inorganic electrolyte system. These findings shed light on the design of

new cells for electrochemical applications.

Reconstructing Nonlinear Force-Free Fields by a Constrained Optimization

S.Nasiri, T. Wiegelmann

It seems that the potential and linear force-free magnetic fields are inadequate to represent the observed

magnetic events occurring in different regions of the solar corona. To reconstruct the nonlinear force-

free fields from the solar surface magnetograms, various analytical and numerical methods have

already been examined by different authors. Here, using the Lagrange multiplier technique, a

constrained optimization approach for reconstructing force-free magnetic fields is proposed. In the

optimization procedure the solenoidal property is considered as a constraint on the initial non-force-

free field. In the Wheatland, Sturrock and Roumeliotis (2000) method as an unconstrained

optimization, both solenoidal and force-free conditions are fulfilled approximately. In contrast, the

constrained optimization method, up to numerical precision, leads us to a nearly force-free magnetic

field with exactly zero divergence. The solutions are obtained and tested by the Low and Lou (1990)

semi-analytic solution.

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Intrinsically water-repellent copper oxide surfaces;

an electro-crystallization approach

Raziyeh Akbari, Gabriela Ramos Chagas, Guilhem Godeau, Mohammadreza Mohammadizadeh,

Frédéric Guittard, Thierry Darmanin

Use of metal oxide thin layers is increased due to their good durablity under environmental conditions.

In this work, the repeatable nanostructured crystalite Cu2O thin films, developed by electrodeposition

method without any physical and chemical modifications, demonstrate good hydrophobicity. Copper

(І) oxide (Cu2O) layers were fabricated on gold/Si(100) substrates by different electrodeposition

methods i.e. galvanostatic deposition, cyclic voltammetry, and pulse potentiostatic deposition and using

copper sulfate (in various concentrations) as a precursor. The greatest crystalline face on prepared

Cu2O samples is (111) which is the most hydrophobic facet of Cu2O cubic structure. Indeed, different

crystallite structures such as nanotriangles and truncated octahedrons were formed on the surface for

various electrodeposition methods. The increase of the contact angle (θw) measured by the rest time,

reaching to about 135º, was seen at different rates and electrodeposition methods. In addition, two-step

deposition surfaces were also prepared by applying two of the mentioned methods, alternatively. In

general, the morphology of the two-step deposition surfaces showed some changes compared to that of

one-step samples, allowing the formation of different crystallite shapes. Moreover, the wettability

behavior showd the larger θw of the two-step deposition layers compared to the related one-step

deposition layers. Therefore, the highest observed θw was related to the one of two-step deposition

layers due to the creation of small octahedral structures on the surface, having narrow and deep valleys.

However, there was an exception which was due to the resulted big structures and broad valleys on the

surface. So, it is possible to engineer different crystallites shapes using the proposed two-step

deposition method. It is expected that hydrophobic crystallite thin films can be used in environmental

and electronic applications to save energy and materials properties.

Generalized Interfrometry

M. Taghi Tavassoly, Hamid Salvdari

When a parallel beam of light undergoes a discontinuous change in phase or in phase gradient in the

central part of the beam, two wavefronts with a common border are formed. In this paper, we formulate

the interference of two such wavefronts and show that conventional diffraction and interference are

special cases of a generalized interference with amplitudes that are determined by the distances of the

observation point from the wavefronts and their boundaries. This formulation permits us to reconstruct

the interfering wavefronts at their original locations. Also, we modulate a phase function on the

interference fringes near the common boundary, where the diffraction effect is significant, and show

this kind of modulation provides a basis for quantitative imaging of phase objects in small scales.

Furthermore, we evaluate the theoretical results by relevant experiments and elaborate on features and

application potential of the interferometry introduced. © 2018 Optical Society of America.

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Crossing statistics of laser light scattered through a nanofluid

M. Arshadi Pirlar, S. M. S. Movahed, D. Razzaghi, R. Karimzadeh

In this paper, we investigate the crossing statistics of speckle patterns formed in the Fresnel diffraction

region by a laser beam scattering through a nanofluid. We extend zero-crossing statistics to assess the

dynamical properties of the nanofluid. According to the joint probability density function of laser beam

fluctuation and its time derivative, the theoretical frameworks for Gaussian and non-Gaussian regimes

are revisited. We count the number of crossings not only at zero level but also for all available

thresholds to determine the average speed of moving particles. Using a probabilistic framework in

determining crossing statistics, a priori Gaussianity is not essentially considered; therefore, even in the

presence of deviation from Gaussian fluctuation, this modified approach is capable of computing

relevant quantities, such as mean value of speed, more precisely. Generalized total crossing, which

represents the weighted summation of crossings for all thresholds to quantify small deviation from

Gaussian statistics, is introduced. This criterion can also manipulate the contribution of noises and

trends to infer reliable physical quantities. The characteristic time scale for having successive crossings

at a given threshold is defined. In our experimental setup, we find that increasing sample temperature

leads to more consistency between Gaussian and perturbative non-Gaussian predictions. The maximum

number of crossings does not necessarily occur at mean level, indicating that we should take into

account other levels in addition to zero level to achieve more accurate assessments.

Über-gravity and the cosmological constant problem

Nima Khosravi

Recently, the idea of taking ensemble average over gravity models has been introduced. Based on this

idea, we study the ensemble average over (effectively) all the gravity models (constructed from Ricci

scalar) dubbing the name über-gravity which is a fixed point in the model space. The über-gravity has

interesting universal properties, independent from the choice of basis: (i) it mimics Einstein–Hilbert

gravity for high-curvature regime, (ii) it predicts stronger gravitational force for an intermediate-

curvature regime, (iii) surprisingly, for low-curvature regime, i.e. R=R0 where R is Ricci scalar and R0

is a given scale, the Lagrangian vanishes automatically and (iiii) there is a sharp transition between

low- and intermediate-curvature regimes at R=R0. We show that the über-gravity response is robust to

all values of vacuum energy, when there is no other matter. So as a toy model, über-gravity, gives a

way to think about the hierarchy problems e.g. the cosmological constant problem. Due to the transition

at R=R0 there is a chance for über-gravity to bypass Weinberg’s no-go theorem. The cosmology of this

model is also promising because of its non-trivial predictions for small curvature scales in comparison

to LCDM model.

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Fresnel diffraction from the edge of a transparent plate in the general case

Hamid Salvdari, M. Taghi Tavassoly

Fresnel diffraction from the edge of a transparent plate with arbitrary orientation of its surfaces is

formulated in transmission mode. It is shown theoretically and evaluated experimentally that the

thickness of a plate and the angles between its surfaces, near the edge, can be determined accurately.

This allows us to construct a quantitative 3D image of the plate edge. It is also illustrated that the

recorded diffraction pattern of a plate edge can be regarded as a hologram produced by the interference

of two diffracted waves: one passing above the plate and the other transmitting through the plate near

the edge. Thus, the hologram makes it possible to reconstruct the plate’s edge as a 3D image, and the

approach can be utilized in constructing 3D images of phase objects and in quantitative phase

microscopy.

Sequential quantum secret sharing in noisy environments

Parvaneh Khakbiz

Sequential Quantum Secret Sharing schemes (QSS) do not use en-tangled states for secret sharing,

rather they rely on sequential operations of the players on a single state which is circulated between the

players. In order to check the viability of these schemes under imperfect operations and noise in the

channels, we consider one such scheme in detail and show that under moderate conditions it is still

possible to extract viable secure shared keys in this scheme. Although we speci cally consider only one

type of sequential scheme and three di erent noise models, our method is fairly general to be applied to

other QSS schemes and noise models as well.

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The Excursion set approach: Stratonovich approximation

and Cholesky decomposition

Farnik Nikakhtar, Mohammadreza Ayromlou, Shant Baghram, Sohrab Rahvar, M Reza Rahimi

Tabar, Ravi K Sheth

The excursion set approach is a framework for estimating how the number density of non-linear

structures in the cosmic web depends on the expansion history of the universe and the nature of gravity.

A key part of the approach is the estimation of the first-crossing distribution of a suitably chosen

barrier by random walks having correlated steps: The shape of the barrier is determined by the physics

of non-linear collapse, and the correlations between steps by the nature of the initial density fluctuation

field. We describe analytic and numerical methods for calculating such first up-crossing distributions.

While the exact solution can be written formally as an infinite series, we show how to approximate it

efficiently using the Stratonovich approximation. We demonstrate its accuracy using Monte Carlo

realizations of the walks, which we generate using a novel Cholesky-decomposition based algorithm,

which is significantly faster than the algorithm that is currently in the literature.

Formation energy and some mechanical properties of hydrogenated hexagonal

monolayer of GeC

Zihab Sohbatzadeha, Hossein Asnaashari Eivarib, Davoud Vahedi Fakhrabad

Mechanical properties of pristine and fully hydrogenated 2D hexagonal GeC monolayer were

investigated by density functional theory calculations. Fully hydrogenated means that there is a

hydrogen atom connected to each Ge and C atoms. Formation energy of fully hydrogenated GeC was

negative which indicates that hydrogenated GeC is energetically stable. Uniaxial and biaxial strains

were applied to the pristine and hydrogenated GeC in harmonic elastic deformation range and in-plane

stiffness and Poissons ratio were calculated by fitting the resulted strained energy to the strain-energy

formula. Calculated in-plane stiffness and Poissons ratio of hydrogenated GeC were respectively about

50% and 30% lower than those of pristine GeC. Pristine and hydrogenated GeCs are semiconductor

and the band gap of hydrogenated GeC is larger than pristine. By Mulliken charge analysis we found

that, in hydrogenated GeC, charge transfers from H atoms to GeC sheet.

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Spread of wave packets in disordered hierarchical lattices

Mohsen Amini

We consider the spreading of a wave packet in the generalized Rosenzweig-Porter random matrix

ensemble in the region of the non-ergodic extended states $1 < \gamma < 2$ . We show that

although non-trivial fractal dimensions $0 < D_{q}=2-\gamma < 1$ characterize wave function

statistics in this region, the wave packet spreading $\langle r^{2} \rangle \propto t^{\beta}$ is

governed by the "diffusion" exponent $\beta=1$ outside the ballistic regime $t>\tau\sim 1$ and

$\langle r^{2}\rangle \propto t^{2}$ in the ballistic regime for $t<\tau\sim 1$ . This demonstrates

that the multifractality appears only in local quantities like the wave packet survival probability but not

in the large-distance spreading of the wave packet.

Deformation and stability of surface states in Dirac semimetals

Mehdi Kargarian, Yuan-Ming Lu, Mohit Randeria

The unusual surface states of topological semimetals have attracted a lot of attention. Recently, we

showed [Proc. Natl. Acad. Sci. USA 113, 8648 (2016)] that for a Dirac semimetal (DSM) arising from

band inversion, such as Na3Bi and Cd3As2, the expected double Fermi arcs on the surface are not

topologically protected. Quite generally, the arcs deform into states similar to those on the surface of a

strong topological insulator. Here we address two questions related to deformation and stability of

surface states in DSMs. First, we discuss why certain perturbations, no matter how large, are unable to

destroy the double Fermi arcs. We show that this is related to a certain extra (particle-hole) symmetry,

which is nongeneric in materials. Second, we discuss situations in which the surface states are

completely destroyed without breaking any symmetry or impacting the bulk Dirac nodes. We are not

aware of any experimental or density functional theory (DFT) candidates for a material which is a bulk

DSM without any surface states, but our results clearly show that this is possible.

Universal rotation of nanowires in static uniform electric fields

in viscous dielectric liquids

Kasra Farain, Ali Esfandiar, Alireza Z. Moshfegh

The wide utilization of nanomanipulation as a promising approach in microorganisms,

nanoelectromechanical systems, and assembly of nanostructures remarks the importance of

nanostructures’ motion in electric fields. Here, we study the rotational dynamics of metallic and non-

metallic nanowires (NWs) in a static uniform electric field in viscous dielectric liquids. For metallic

NWs, it has been theoretically shown that the electric field-induced rotation is practically independent

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of the geometrical dimensions and the electrical properties of NWs. Our experimental results for

suspended silver (Ag) NWs in microscope oil are perfectly in agreement with this model. However, in

the case of TiO2 NWs, as an example of non-metallic NWs, we surprisingly observe the exact same

electromechanical torque as metallic Ag NWs under the same experimental conditions. This is mainly

explained by NWs’ high aspect-ratio which allows one to ignore the non-axial component of the

electric field inside the NWs. Therefore, all high-aspect-ratio metallic Ag and non-metallic TiO2 NWs

demonstrate an identical rotational speed in the same dielectric liquid and electric field. This result can

be used for the controllable alignment or synchronous rotation of an ensemble of different types of

NWs for hybrid and advanced devices.

Iterative phase retrieval algorithm for reconstruction

of two arbitrary interfering fields

Roghayeh Yazdani, Hamidreza Fallahi,

We present a simple and robust method to simultaneously reconstruct two unknown interfering fields.

First, the interference field (IF) is recovered from diffraction interference intensity recordings. The

recovered IF along with a set of interference intensities generated by the phase shifting technique is

used in an iterative phase retrieval algorithm to derive both the phase and amplitude information of the

interfering fields. Numerical simulations are presented to validate the proposed method. In the

simulation, we consider two arbitrary interfering fields with unrelated amplitudes and phases, creating

a difficult problem where two complicated fields must be retrieved simultaneously. In addition, the

phase of the second interfering field contains a vortex with a topological charge of 5. Under noise-free

conditions, the relative errors of phases, defined as the root-mean-square (RMS) value of the residual

phase divided by the RMS value of the original phase, for the first and second interfering fields are of

the order of 10−5 and 10−6, respectively, where the relative error of amplitudes is of the order of 10−7.

For 5% and 10% noise, the obtained relative error of phase is of the order of 10−2 for the first

interfering field and 10−3 for the second interfering field, where the relative error of amplitudes is of

the order of 10−2. These results show the success of the proposed method even under noisy conditions

and in the presence of phase vortices.

Non-criticality of interaction network over system’s crises:

A percolation analysis

Amir Hossein Shirazi, Abbas Ali Saberi, Ali Hosseiny, Ehsan Amirzadeh,

Pourya Toranj Simin

Extraction of interaction networks from multi-variate time-series is one of the topics of broad interest

in complex systems. Although this method has a wide range of applications, most of the previous

analyses have focused on the pairwise relations. Here we establish the potential of such a method to

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elicit aggregated behavior of the system by making a connection with the concepts from percolation

theory. We study the dynamical interaction networks of a financial market extracted from the

correlation network of indices, and build a weighted network. In correspondence with the percolation

model, we find that away from financial crises the interaction network behaves like a critical random

network of Erdős-Rényi, while close to a financial crisis, our model deviates from the critical random

network and behaves differently at different size scales. We perform further analysis to clarify that our

observation is not a simple consequence of the growth in correlations over the crises.

Spin supersolid phase in coupled alternating spin chains

F. Heydarinasab, J. Abouie

We study the ground state phase diagram of a two dimensional mixed-spin system of coupled

alternating spin-1 and 1/2 chains with a stripe supersolid phase. Utilizing different analytical and

numerical approaches such as mean field approximation, cluster mean field theory and linear spin wave

theory, we demonstrate that our system displays a rich ground state phase diagram including novel

stripe supersolid, solids with different fillings and super-counterfluid phases, in addition to a stripe

solid with half filling, superfluid and Mott insulating phases. In order to find a minimal mixedspin

model for stripe supersolidity, in the second part of the paper we consider two kinds of mixed-spin

system of coupled alternating spin-1 and 1/2 chains with (i) anisotropic nearest neighbor interactions,

(ii) anisotropic hoppings and study their ground state phase diagrams. We demonstrate that, for the

systems with uniform hoppings, the repulsive intra-chains interactions are necessary for stripe

supersolidity. In this case the minimal two dimensional mixed-spin model is a system of spin-1 and

spin-1/2 XXZ chains, interacting via Ising Hamiltonian. In the case of anisotropic hoppings, a system

of coupled Ising chains is the minimal model.

Synthesis and characterization of iron based superconductor Nd-1111

Zahra Alborzi, Vahid Daadmehr

Polycrystalline sample of NdFeAsO0.8F0.2 was prepared by one-step solid-state reaction method. The

structural and electrical properties of sample were characterized through XRD pattern and the 4-probe

method. The critical temperature was obtained at 56 K. The crystal structure was tetragonal with

P4/nmm:2 symmetry group.

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Planck 2015 results. XIII. Cosmological parameters

Marziyeh Farhang, Planck Collaboration

This paper presents cosmological results based on full-mission Planck observations of temperature and

polarization anisotropies of the cosmic microwave background (CMB) radiation. Our results are in very

good agreement with the 2013 analysis of the Planck nominal-mission temperature data, but with

increased precision. The temperature and polarization power spectra are consistent with the standard

spatially-flat 6-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar

perturbations (denoted "base ΛCDM" in this paper). From the Planck temperature data combined with

Planck lensing, for this cosmology we find a Hubble constant, H0 = (67.8 ± 0.9) km s-1Mpc-1, a matter

density parameter Ωm = 0.308 ± 0.012, and a tilted scalar spectral index with ns = 0.968 ± 0.006,

consistent with the 2013 analysis. Note that in this abstract we quote 68% confidence limits on

measured parameters and 95% upper limits on other parameters. We present the first results of

polarization measurements with the Low Frequency Instrument at large angular scales. Combined with

the Planck temperature and lensing data, these measurements give a reionization optical depth of τ =

0.066 ± 0.016, corresponding to a reionization redshift of z_re=8.8+1.7-1.4. These results are

consistent with those from WMAP polarization measurements cleaned for dust emission using 353-

GHz polarization maps from the High Frequency Instrument. We find no evidence for any departure

from base ΛCDM in the neutrino sector of the theory; for example, combining Planck observations

with other astrophysical data we find Neff = 3.15 ± 0.23 for the effective number of relativistic degrees

of freedom, consistent with the value Neff = 3.046 of the Standard Model of particle physics. The sum

of neutrino masses is constrained to ∑ mν < 0.23 eV. The spatial curvature of our Universe is found

to be very close to zero, with | ΩK | < 0.005. Adding a tensor component as a single-parameter

extension to base ΛCDM we find an upper limit on the tensor-to-scalar ratio of r0.002< 0.11,

consistent with the Planck 2013 results and consistent with the B-mode polarization constraints from a

joint analysis of BICEP2, Keck Array, and Planck (BKP) data. Adding the BKP B-mode data to our

analysis leads to a tighter constraint of r0.002 < 0.09 and disfavours inflationarymodels with a V(φ)

∝ φ2 potential. The addition of Planck polarization data leads to strong constraints on deviations from a

purely adiabatic spectrum of fluctuations. We find no evidence for any contribution from isocurvature

perturbations or from cosmic defects. Combining Planck data with other astrophysical data, including

Type Ia supernovae, the equation of state of dark energy is constrained to w = -1.006 ± 0.045,

consistent with the expected value for a cosmological constant. The standard big bang nucleosynthesis

predictions for the helium and deuterium abundances for the best-fit Planck base ΛCDM cosmology

are in excellent agreement with observations. We also constraints on annihilating dark matter and on

possible deviations from the standard recombination history. In neither case do we find no evidence for

new physics. The Planck results for base ΛCDM are in good agreement with baryon acoustic

oscillation data and with the JLA sample of Type Ia supernovae. However, as in the 2013 analysis, the

amplitude of the fluctuation spectrum is found to be higher than inferred from some analyses of rich

cluster counts and weak gravitational lensing. We show that these tensions cannot easily be resolved

with simple modifications of the base ΛCDM cosmology. Apart from these tensions, the base ΛCDM

cosmology provides an excellent description of the Planck CMB observations and many other

astrophysical data sets.

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Secure alignment of coordinate systems using quantum correlation

F. Rezazadeh, A. Mani, V.Karimipour

We show that two parties far apart can use shared entangled states and classical communication to align

their coordinate systems with a very high fidelity. Moreover, compared with previous methods

proposed for such a task, i.e., sending parallel or antiparallel pairs or groups of spin states, our method

has the extra advantages of using single-qubit measurements and also being secure, so that third parties

do not extract any information about the aligned coordinate system established between the two parties.

The latter property is important in many other quantum information protocols in which measurements

inevitably play a significant role.

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Documents

گردهمایی سراسری فیزیک ایران، 6 دی ماه 1397، دانشکده فیزیک ...Effects of low-dimensional material channels on energy ... Synthesis and characterization