Viscous Dark Energy in $f(T)$ Gravity

TL;DR

This paper explores how bulk viscosity influences dark energy models within $f(T)$ gravity, showing that viscosity can drive the universe from deceleration to acceleration and lead to phantom domination.

Contribution

It introduces a viscous dark energy framework in $f(T)$ gravity with a time-dependent viscosity, analyzing its impact on cosmic acceleration and phantom crossing.

Findings

Viscosity induces transition from deceleration to acceleration.

Viscosity causes crossing of the phantom divide line.

Universe becomes phantom dominated for certain viscous coefficients.

Abstract

We study the bulk viscosity taking dust matter in the generalized teleparallel gravity. We consider different dark energy models in this scenario along with a time dependent viscous model to construct the viscous equation of state parameter for these dark energy models. We discuss the graphical representation of this parameter to investigate the viscosity effects on the accelerating expansion of the universe. It is mentioned here that the behavior of the universe depends upon the viscous coefficients showing the transition from decelerating to accelerating phase. It leads to the crossing of phantom divide line and becomes phantom dominated for specific ranges of these coefficients.