f(R,T) Gravity Model Behaving as a Dark Energy Source

TL;DR

This paper explores a 5D f(R,T) gravity model that exhibits super-exponential expansion, behaves like dark energy, and predicts a universe approaching a de-Sitter phase without initial singularity.

Contribution

It provides exact solutions in 5D f(R,T) gravity showing a universe mimicking dark energy with a stable, non-singular, super-expanding model.

Findings

Universe undergoes super-exponential expansion.

Model behaves like dark energy or vacuum energy.

Universe approaches a de-Sitter phase in finite time.

Abstract

Within the limits of the present cosmological observations in f(R,T) gravity theory, we have analyzed a spherically symmetric space-time in 5D setting. The field equations have been carefully studied considering reasonable cosmological assumptions to obtain exact solutions. We have obtained an isotropic model universe undergoing super-exponential expansion. It is predicted that the model universe behaves like a dark energy (vacuum energy) model. In the present scenario, the model evolves with a slow and uniform change of shape. It is observed that the universe is close to or nearly flat. The model is free from initial singularity and is predicted to approach the de-Sitter phase dominated by vacuum energy or cosmological constant in the finite-time future. A comprehensive discussion on the cosmological parameters obtained in view of the recent studies is presented in detail with graphs.