Scalar field with the source in the form of the stress-energy tensor trace as a dark energy model

TL;DR

This paper explores a scalar-tensor gravity model where the scalar field's source is its own stress-energy trace, demonstrating a slow-roll regime that can reproduce current cosmological parameters.

Contribution

It introduces a novel scalar-tensor model with the scalar source as the stress-energy trace, providing numerical solutions that match observed cosmological data.

Findings

Existence of a slow-roll regime in the model

Reproduction of current Hubble and deceleration parameters

Potential explanation for dark energy phenomena

Abstract

We consider a scalar-tensor theory of gravitation with the scalar source being the trace of the stress-energy tensor of the scalar field itself and matter. We obtain an example of a numerical solution of the cosmological equations which shows that under some special choice of the scalar parameters, there exists a slow-roll regime in which the modern values of the Hubble and deceleration parameters may be obtained.