Bianchi type-V dark energy model with varying EoS parameter

TL;DR

This paper explores an anisotropic Bianchi type-V cosmological model with a dynamic dark energy equation of state, deriving exact solutions and analyzing universe evolution stages based on observational data.

Contribution

It presents a new exact solution for a Bianchi type-V universe with a varying dark energy EoS parameter, incorporating anisotropic matter and observational constraints.

Findings

EoS parameter for dark energy varies with time.

Deceleration parameter is time-dependent.

Model aligns with observational data on universe evolution.

Abstract

Within the scope of an anisotropic Bianchi type-V cosmological model we have studied the evolution of the universe. The assumption of a diagonal energy-momentum tensor leads to some severe restriction on the metric functions, which on its part imposes restriction on the components of the energy momentum tensor. This model allows anisotropic matter distribution. Further using the proportionality condition that relates the shear scalar $(\sigma)$ in the model is proportional to expansion scalar $(\vartheta)$ and the variation law of Hubble parameter, connecting Hubble parameter with volume scale. Exact solution to the corresponding equations are obtained. The EoS parameter for dark energy as well as deceleration parameter is found to be the time varying functions. A qualitative picture of the evolution of the universe corresponding to different of its stages is given using the latest observational data.