arXiv subjects

Abdussattar

Publications and source records attributed to Abdussattar.

2 recordsLinked to original sources

arXiv2016

Friedmann-Robertson-Walker Models with Late-Time Acceleration

In order to account for the observed cosmic acceleration, a modification of the ansatz for the variation of density in Friedman-Robertson-Walker (FRW) models given by Islam is proposed. The modified ansatz leads to an equation of state which corresponds to that of a variable Chaplygin gas, which in the course of evolution reduces to that of a modified generalized Chaplygin gas (MGCG) and a Chaplygin gas (CG), exhibiting late-time acceleration.

physics.gen-ph↗

arXiv2003

Cosmological Models Generalising Robertson-Walker Models

Considering the physical 3-space t = constant of the spacetime metrics as spheroidal and pseudo spheroidal, cosmological models which are generalizations of Robertson-Walker models are obtained. Specific forms of these general models as solutions of Einstein's field equations are also discussed in the radiation- and the matter-dominated eras of the universe.

gr-qc↗