Cosmology in f(R) exponential gravity

TL;DR

This paper investigates the cosmological evolution in an exponential f(R) gravity model, using a direct Ricci scalar approach that simplifies equations and avoids frame-related issues, aiming to explain the Universe's accelerated expansion.

Contribution

It introduces a direct Ricci scalar method for analyzing exponential f(R) gravity, providing a simpler, frame-independent framework for cosmological studies.

Findings

The approach yields a straightforward system of equations suitable for numerical analysis.

The model can potentially explain the Universe's accelerated expansion.

It avoids complications associated with scalar-tensor frame discussions.

Abstract

Using an approach that treats the Ricci scalar itself as a degree of freedom, we analyze the cosmological evolution within an f(R) model that has been proposed recently (exponential gravity) and that can be viable for explaining the accelerated expansion and other features of the Universe. This approach differs from the usual scalar-tensor method and, among other things, it spares us from dealing with unnecessary discussions about frames. It also leads to a simple system of equations which is particularly suited for a numerical analysis.