Modeling of accelerating Universe with bulk viscous fluid in Bianchi V space-time

TL;DR

This paper models an accelerating, anisotropic universe with bulk viscous fluid in Bianchi V space-time, constraining parameters using recent observational data and analyzing the universe's transition and jerk parameters.

Contribution

It introduces a bulk viscous anisotropic universe model constrained by recent $H(z)$ and Pantheon data, and examines its deviation from the $ ext{Lambda}$CDM model.

Findings

Estimated Hubble constant values consistent with recent data.

The universe's transition red-shift is identified as $z_{t} = 0.73$.

The model shows a marginal departure from the $ ext{Lambda}$CDM model.

Abstract

In this paper, we have investigated a bulk viscous anisotropic Universe and constrained its model parameters with recent $H(z)$ and Pantheon compilation data. Using cosmic chronometric technique, we estimate the present value of Hubble's constant as $H_{0} = 69.39 \pm 1.54~km~s^{-1}Mpc^{-1}$, $70.016 \pm 1.65~km~s^{-1}Mpc^{-1}$ and $69.36 \pm 1.42~km~s^{-1}Mpc^{-1}$ by bounding our derived model with recent $H(z)$ data, Pantheon and joint $H(z)$ and Pantheon data respectively. The present age of the Universe is specified as $t_0= 0.9796H_0^{-1}\sim 13.79$ Gyrs. The model favours a transitioning Universe with the transition red-shift as $z_{t} = 0.73$. We have reconstructed the jerk parameter using the observational data sets. From the analysis of the jerk parameter, it is observed that, our derived model shows a marginal departure from the concordance $\Lambda$CDM model.