arXiv subjects

J. P. Shahi

Publications and source records attributed to J. P. Shahi.

2 recordsLinked to original sources

arXiv2007

LRS Bianchi Type-V Viscous Fluid Universe With a Time Dependent Cosmological Term $Λ$

An LRS Bianchi type-V cosmological models representing a viscous fluid distribution with a time dependent cosmological term $Λ$ is investigated. To get a determinate solution, the viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density. It turns out that the cosmological term $Λ(t)$ is a decreasing function of time, which is consistent with recent observations of type Ia supernovae. Various physical and kinematic features of these models have also been explored.

gr-qc↗

arXiv2006

Cosmological Models of Universe with Variable Deceleration Parameter in Lyra's Manifold

FRW models of the universe have been studied in the cosmological theory based on Lyra's manifold. A new class of exact solutions has been obtained by considering a time dependent displacement field for variable deceleration parameter from which three models of the universe are derived (i) exponential (ii) polynomial and (iii) sinusoidal form respectively. The behaviour of these models of the universe are also discussed. Finally some possibilities of further problems and their investigations have been pointed out.

gr-qc↗