Effect of bulk viscosity in cosmic acceleration

TL;DR

This paper explores how bulk viscosity in a viscous fluid influences late-time cosmic acceleration within the $f(R,T)$ gravity framework, showing alignment with observational data and indicating quintessence-like behavior.

Contribution

It introduces a formalism for analyzing viscous fluid effects on cosmic expansion in $f(R,T)$ gravity, highlighting the impact of viscosity on late-time acceleration.

Findings

Viscous fluid induces quintessence-like behavior.

Model aligns with cosmological observations.

Bulk viscosity affects cosmic acceleration dynamics.

Abstract

In this paper, we have investigated the late time cosmic acceleration issue in the context of $f(R,T)$ gravity. The matter field is considered to be that of viscous fluid. The model has been framed as a mathematical formalism and the effect of viscous fluid on the cosmic expansion has been shown. The equation of state parameter indicates the quintessence behaviour of the Universe at late time. The theoretical results obtained here shows its alignment with the cosmological observations result.