Anisotropic cosmological models with perfect fluid and dark energy

TL;DR

This paper explores anisotropic Bianchi type-I cosmological models incorporating both perfect fluid and dark energy, deriving exact solutions to Einstein's equations for different dark energy types.

Contribution

It presents new exact solutions for Bianchi type-I models with mixed matter content, including quintessence and Chaplygin gas dark energy.

Findings

Exact solutions for BI models with perfect fluid and dark energy.

Analysis of models with different dark energy equations of state.

Insights into anisotropic universe evolution with dark energy.

Abstract

We consider a self-consistent system of Bianchi type-I (BI) gravitational field and a binary mixture of perfect fluid and dark energy. The perfect fluid is taken to be the one obeying the usual equation of state, i.e., $p = \zeta \ve$, with $\zeta \in [0, 1]$ whereas, the dark energy density is considered to be either the quintessence or the Chaplygin gas. Exact solutions to the corresponding Einstein equations are obtained.