Bianchi Type III String Cosmological Models with Time Dependent Bulk Viscosity

TL;DR

This paper explores Bianchi Type III string cosmological models incorporating time-dependent bulk viscosity, analyzing their behavior with and without viscosity and discussing their physical implications.

Contribution

It introduces a new class of Bianchi Type III models with bulk viscosity where viscosity is inversely proportional to expansion, providing exact solutions and physical insights.

Findings

Models exhibit different behaviors with and without bulk viscosity.

Bulk viscosity affects the universe's expansion dynamics.

Physical properties of the models are thoroughly discussed.

Abstract

Bianchi type III string cosmological models with bulk viscous fluid for massive string are investigated. To get the determinate model of the universe, we have assumed that the coefficient of bulk viscosity ($\xi$) is inversely proportional to the expansion ($\theta$) in the model and expansion ($\theta$) in the model is proportional to the shear ($\sigma$). This leads to $B = \ell C^{n}$, $\ell$ and $n$ are constants. The behaviour of the model in presence and absence of bulk viscosity, is discussed. The physical implications of the models are also discussed in detail.