First-order thermodynamics of scalar-tensor gravity
Abstract
The first-order thermodynamics of scalar-tensor theory is a novel approach that exploits the intriguing relationship between gravity and thermodynamics to better understand the space of gravity theories. It is based on using Eckart's first-order irreversible thermodynamics on the effective imperfect fluid describing scalar-tensor gravity and characterises General Relativity as an equilibrium state, and scalar-tensor theories as non-equilibrium states, naturally describing the approach to equilibrium. Applications of this framework to cosmology, extensions to different classes of modified theories, and the formulation of two complementary descriptions based on the notions of temperature and chemical potential all contribute to a new and unifying picture of the landscape of gravity theories.
Cite
@article{arxiv.2306.01580,
title = {First-order thermodynamics of scalar-tensor gravity},
author = {Serena Giardino and Andrea Giusti},
journal= {arXiv preprint arXiv:2306.01580},
year = {2023}
}
Comments
20 pages. The results contained in this paper have been partially presented at WASCOM 2021