Reheating and particle creation in unimodular f(R, T) gravity

TL;DR

This paper investigates cosmological inflation, reheating, and particle creation within unimodular f(R,T) gravity, deriving analytical and numerical results to constrain model parameters and understand particle production during the early universe.

Contribution

It introduces a framework for analyzing reheating and particle creation in unimodular f(R,T) gravity, providing analytical solutions and parameter constraints.

Findings

Reheating temperature expressed in terms of spectral index and power spectrum.

Quantification of particle creation in a flat, homogeneous, isotropic universe.

Analytical and numerical solutions for the model's evolution.

Abstract

We study cosmological inflation and reheating in the unimodular f(R,T) gravity. During the reheating era, which takes place just after the end of inflation, the energy density of inflaton is converted to radiation energy through, for instance, rapid oscillation about the minimum of the potential. We quantify our investigation by calculating the reheating temperature. This quantity is written in terms of the spectral index and the power spectrum, which provides a suitable framework to constrain the parameter space of the model. We discuss the massless particle creation for a spatially flat, homogeneous and isotropic universe in the context of unimodular f(R, T) gravity. We obtain the number of created particles per unit volume of space. In order to avoid the complexity of field equations, we conformally transform in Einstein frame and investigate the reheating by considering some specific illustrative examples. Also we obtain the corresponding analytical solutions in addition to some numerical estimations.