Intermediate Coupling Regime in Dilatonic $f(R,T)$ Inflationary Universe

TL;DR

This paper explores how dilatonic $f(R,T)$ gravity with an intermediate coupling regime can successfully model the inflationary phase of the early Universe, aligning theoretical predictions with Planck 2018 observational data.

Contribution

It demonstrates that the intermediate coupling regime in dilatonic $f(R,T)$ gravity allows for inflationary models consistent with observational data, overcoming limitations of standard exponential potentials.

Findings

Dilatonic $f(R,T)$ gravity can match Planck 2018 data.

Intermediate coupling regime is crucial for observational consistency.

Standard exponential potentials are insufficient for accurate inflation modeling.

Abstract

In the present work we study cosmology in dilatonic $f(R,T)$ gravity to address the inflationary phase of the early Universe. As usual, in dilatonic gravity the scalar potential assumes the exponential form. However, this potential is not good enough to be in accord with the Planck 2018 data. More strikingly, the generalized $\beta$-exponential cannot take this into account either. It is just the presence of the dilatonic sector, in the intermediate coupling regime, that can help the theory to be in full accord with the observational data.