Anisotropic model of dark energy dominated universe with hybrid expansion law

TL;DR

This paper explores an anisotropic Bianchi-V universe model with hybrid expansion law, showing a transition from deceleration to acceleration and eventual isotropization, with dark energy resembling a cosmological constant at late times.

Contribution

It introduces a Bianchi-V universe model with hybrid expansion law, analyzing its anisotropic to isotropic transition and dark energy behavior.

Findings

Universe transitions from deceleration to acceleration.

Anisotropic early universe becomes isotropic at late times.

Dark energy behaves like a cosmological constant at late times.

Abstract

The paper deals with the study of the dynamics of Universe within the framework of a spatially homogeneous Bianchi-V space-time filled with a perfect fluid composed of non-interacting matter and dynamical dark energy components. We determine the Bianchi-V space-time by considering hybrid expansion law (HEL) for the average scale factor that yields power-law and exponential-law cosmologies in its special cases. In the HEL cosmology, the Universe exhibits transition from deceleration to acceleration. We find that the HEL Universe within the framework of Bianchi-V space-time is anisotropic at the early stages of evolution and becomes isotropic at late times. The dynamical dark energy in the HEL Bianchi-V Universe does not show departure from the usual cosmological constant at later times.