Cosmological consequences and statefinder diagnosis of a non-interacting generalized Chaplygin gas in $f(R,T)$ gravity

TL;DR

This paper explores the cosmological implications of a non-interacting generalized Chaplygin gas within $f(R,T)$ gravity, analyzing its role in accelerated expansion and employing the statefinder diagnostic to distinguish models.

Contribution

It introduces a specific $f(R,T)$ gravity model with GCG and baryonic matter, analyzing three classes of GCG models in high and low pressure regimes.

Findings

Accelerated expansion explained by GCG in $f(R,T)$ gravity.

Distinct statefinder signatures for different GCG models.

Constraints on $f(R,T)$ functions from cosmological observations.

Abstract

In this paper, we investigate cosmological consequences of a scenario for recently reported accelerated expansion of the Universe, in which the generalized Chaplygin gas (GCG) along with the baryonic matter are responsible for this observed phenomenon. In the present model, we employ an isotropic and homogeneous FLRW space time in the framework of $f(R,T)$ theory of gravity. In $f(R,T)$ gravity, the conservation of energy-momentum tensor (EMT) leads to a constraint equation which enforces us to use some specific forms of type $f(R,T)=g(R)+h(T)$. In this work we choose $g(R)=R$. We consider three classes of Chaplygin gas models which include three different forms of $f(R,T)$ function; those models which employ the standard Chaplygin gas (SCG), models which use GCG in the high pressure regimes and finally, the third case is devoted to investigating high density regimes in the presence of GCG.