arXiv subjects

S. Fathi

Publications and source records attributed to S. Fathi.

2 recordsLinked to original sources

arXiv2020

The cosmological bulk flow in QCDM model: (In)consistency with $\Lambda CDM$

We study the bulk flow of the local universe using Type Ia supernova data by considering a class of cosmological model which is spatially flat,(FRW) space-times and contains cold dark matter and $Q$ component (QCDM models) of the fluid as a scalar field, with self interactions determined by a potential $V(Q)=V_{0}Exp(-\lambda Q)$ evolving in Universe. We use different cumulative redshift slices of the Union 2 catalogue. A maximum-likelihood analysis of peculiar velocities confirms that at low redshift $0.015 100 h^{-1}Mpc)$, they leaving an imprint on the microwave background anisotropy.

astro-ph.CO↗

arXiv2005

Study of Dissipative System of Charged Particles by Wigner's Functions

Recently, it is shown that the extended phase space formulation of quantum mechanics is a suitable technique for studying the quantum dissipative system. Here, as an application of this formalism, we consider a dissipative system of charged particles interacting with an external time dependent electric field. Such a system has been investigating by Buch and Denman, and two solutions with completely different structure have been obtained for Schrödinger's equation in two different gauges. We demonstrate how both gauges lead to the same conductivity by generalizing the gauge transformations to the phase space and using the extended phase space technique.

quant-ph↗