Dark Energy Model in Anisotropic Bianchi Type-III Space-Time with Variable EoS Parameter

TL;DR

This paper proposes a new dark energy model within anisotropic Bianchi type-III space-time, featuring a variable EoS parameter that aligns with recent observational data and explains the universe's accelerated expansion.

Contribution

It introduces a deterministic dark energy model with a time-dependent EoS parameter in anisotropic space-time, consistent with observational constraints.

Findings

EoS parameter is time-dependent and observationally consistent.

Model explains the universe's accelerated expansion.

Physical aspects of dark energy are discussed.

Abstract

A new dark energy model in anisotropic Bianchi type-III space-time with variable equation of state (EoS) parameter has been investigated in the present paper. To get the deterministic model, we consider that the expansion $\theta$ in the model is proportional to the eigen value $\sigma^{2}_{~2}$ of the shear tensor $\sigma^{j}_~i$. The EoS parameter $\omega$ is found to be time dependent and its existing range for this model is in good agreement with the recent observations of SNe Ia data (Knop et al. 2003) and SNe Ia data with CMBR anisotropy and galaxy clustering statistics (Tegmark et al. 2004). It has been suggested that the dark energy that explains the observed accelerating expansion of the universe may arise due to the contribution to the vacuum energy of the EoS in a time dependent background. Some physical aspects of dark energy model are also discussed.