Bianchi Type-V Bulk Viscous Cosmic String inf(R,T)Gravity with Time Varying Deceleration Parameter

Bïnaya K Bishi,K L Mahanta

doi:10.1155/2015/491403

Abstract

We study the Bianchi type-V string cosmological model with bulk viscosity inf(R,T)theory of gravity by considering a special form and linearly varying deceleration parameter. This is an extension of the earlier work of Naidu et al., 2013, where they have constructed the model by considering a constant deceleration parameter. Here we find that the cosmic strings do not survive in both models. In addition we study some physical and kinematical properties of both models. We observe that in one of our models these properties are identical to the model obtained by Naidu et al., 2013, and in the other model the behavior of these parameters is different.

Highlights

Recent data obtained in observational cosmology [1,2,3,4,5] indicate that currently our universe is accelerating
In this work we investigate the role of variable deceleration parameter in Bianchi type-V space time with bulk viscous cosmic string and f(R, T) gravity
In this work we have studied the Bianchi type-V bulk viscous string cosmological model in f(R, T) theory of gravity with variable deceleration parameters

Summary

Introduction

Recent data obtained in observational cosmology [1,2,3,4,5] indicate that currently our universe is accelerating. Where f(R, T) is an arbitrary function of the Ricci scalar (R) and trace (T) of energy tensor of the matter Tij and Lm represents matter Lagrangian density They have derived the field equations of f(R, T) gravity by varying the action S of the gravitational field with respect to the metric tensor components gij. Many researchers have shown interest to study bulk viscous string cosmological model in the context of Einstein theory or modified theories of gravity. Motivated by the above discussion, here we have constructed Bianchi type-V bulk viscous string cosmological model in f(R, T) gravity with special form of deceleration parameter and linearly varying deceleration parameter. In this work we investigate the role of variable deceleration parameter in Bianchi type-V space time with bulk viscous cosmic string and f(R, T) gravity

Metric and Field Equations

Solution of the Field Equations

Concluding Remarks