Anisotropic Universe Models with Perfect Fluid and Scalar Field in f(R,T) Gravity

TL;DR

This paper explores anisotropic universe models with perfect fluid and scalar fields within $f(R,T)$ gravity, deriving exact solutions and analyzing their physical properties and evolution, including energy conditions and phantom behavior.

Contribution

It introduces exact solutions for anisotropic $f(R,T)$ gravity models with perfect fluid and scalar fields, linking these solutions to phantom and scalar field behaviors.

Findings

Perfect fluid solutions can behave like phantom models.

Solutions correspond to massless scalar field models.

Null energy condition validity varies with model parameters.

Abstract

In this paper, we study the behavior of perfect fluid and massless scalar field for homogeneous and anisotropic Bianchi type I universe model in $f(R,T)$ gravity, where $R$ is the Ricci scalar and $T$ is the trace of the energy-momentum tensor. We assume the variation law of mean Hubble parameter to obtain exact solutions of the modified field equations. The physical and kinematical quantities are discussed for both models in future evolution of the universe. We check the validity of null energy condition and conclude that our perfect fluid solution can behave like phantom model. Finally, we find that perfect fluid solutions correspond to massless scalar field models.