# Dynamics of Bianchi $VI_h$ Universe with Bulk Viscous Fluid in Modified Gravity

## TL;DR

This paper investigates the evolution of anisotropic Bianchi VI_h universe models with bulk viscous fluid within a modified gravity framework, revealing conditions for quintessence-like behavior and analyzing physical properties and energy conditions.

## Contribution

It introduces specific Bianchi VI_h cosmological models in f(R,T) gravity with bulk viscosity, exploring their dynamics and compatibility with observations for different h values.

## Key findings

- Models with h=-1 and 0 exhibit quintessence behavior.
- Bulk viscous coefficient remains positive and constant at late times.
- No viable model found for h=1 in current observational context.

## Abstract

In this paper, the dynamical behavior of the anisotropic universe has been investigated in $f(R,T)$ theory of gravity. The functional $f(R,T)$ has been rescaled in the form $f(R,T)=\mu R+\mu T$, where $R$ is the Ricci scalar and $T$ is the trace of energy momentum tensor. Three cosmological models are constructed using the power law expansion in Bianchi type $VI_h$ ($BVI_h$) universe for three different values of $h=-1,0,1$, where the matter field is considered to be of bulk viscous fluid. It is found from the model that the anisotropic $BVI_h$ model in the modified theory of gravity is in agreement with a quintessence phase for the value of $h=-1$ and $0$. We could not obtain a viable cosmological model in accordance with the present day observations for $h=1$. The bulk viscous coefficient in both the cases are found to be positive and remain constant at late time. The physical behaviors of the models along with the energy conditions are also studied.