Bianchi Type-I Universe with Wet Dark Fluid

TL;DR

This paper explores a Bianchi type-I universe model filled with wet dark fluid, deriving exact solutions for different cases and analyzing the universe's expansion behavior with a new dark energy equation of state.

Contribution

It introduces a novel equation of state for dark energy inspired by liquids and provides exact solutions for the Bianchi type-I universe with this fluid.

Findings

Exact solutions for the field equations are obtained.

The model's behavior is analyzed for power-law and exponential expansion.

Special cases with specific gamma values are discussed.

Abstract

The Bianchi type-I universe filled with dark energy from a wet dark fluid has been considered. A new equation of state for the dark energy component of the universe has been used. It is modeled on the equation of state $p=\gamma (\rho -\rho_\star)$ which can describe a liquid, for example water. The exact solutions to the corresponding field equations are obtained in quadrature form. The solution for constant deceleration parameter have been studied in detail for power-law and exponential forms both. The cases $\gamma =1$ and $\gamma =0$ have been also analysed.