Brans-Dicke Cosmology: Thermodynamic viability

TL;DR

This paper tests Brans-Dicke cosmological models for a homogeneous universe against the Generalized Second Law of Thermodynamics in the Einstein frame, finding they are viable for negative Brans-Dicke parameters and align with accelerated cosmic expansion.

Contribution

It evaluates the thermodynamic viability of Brans-Dicke models in the Einstein frame, highlighting conditions for consistency with universe acceleration.

Findings

Models are thermodynamically viable for negative w

Models are consistent with recent accelerated expansion

GSL validity constrains Brans-Dicke parameter w

Abstract

Brans-Dicke cosmological models for a spatially isotropic and homogeneous universe are tested in terms of the validity of the Generalized Second Law of Thermodynamics (GSL). The investigation is carried out in the Einstein frame. It is found that the models are thermodynamically viable for negative values of the Brans-Dicke parameter w and thus are quite consistent with the recent accelerated expansion of the universe.