Entropy and statefinder diagnosis in chameleon cosmology

TL;DR

This paper investigates thermodynamic laws and entropy in bouncing chameleon cosmology, introducing a new thermodynamic parameter and using statefinders to distinguish dark energy models.

Contribution

It introduces a model-independent thermodynamic parameter and applies entropy and statefinder diagnostics to chameleon cosmology.

Findings

Revisits the generalized second law of thermodynamics in bouncing cosmology.

Proposes a new thermodynamic state parameter linked to entropy rate and temperature.

Uses entropy and statefinder diagnostics to differentiate dark energy models.

Abstract

In this paper, the generalized second law (GSL) of thermodynamics and entropy is revisited in the context of cosmological models with bouncing behavior such as chameleon cosmology where the boundary of the universe is assumed to be enclosed by the dynamical apparent horizon. From a thermodynamic point of view, to link between thermodynamic and geometric parameters in cosmological models, we introduce "entropy rate of change multiplied by the temperature" as a model independent thermodynamic state parameter together with the well known $\{r,s \}$ statefinder to differentiate the dark energy models.