Thermodynamical description of modified generalized Chaplygin gas model of dark energy

TL;DR

This paper provides a thermodynamical analysis of the modified generalized Chaplygin gas model for dark energy, exploring interactions with dark matter and implications for the coincidence problem in cosmology.

Contribution

It introduces a thermodynamical interpretation of the interacting modified generalized Chaplygin gas model in a cosmological setting, addressing the coincidence problem and thermal fluctuations.

Findings

Thermodynamical interpretation for non-interacting and interacting models.

Constraints on coupling constants to solve the coincidence problem.

Relation between thermal fluctuations and dark sector interactions.

Abstract

We consider a universe filled by a modified generalized Chaplygin gas together with a pressureless dark matter component. We get a thermodynamical interpretation for the modified generalized Chaplygin gas confined to the apparent horizon of FRW universe, whiles dark sectors do not interact with each other. Thereinafter, by taking into account a mutual interaction between the dark sectors of the cosmos, we find a thermodynamical interpretation for interacting modified generalized Chaplygin gas. Additionally, probable relation between the thermal fluctuations of the system and the assumed mutual interaction is investigated. Finally, we show that if one wants to solve the coincidence problem by using this mutual interaction, then the coupling constants of the interaction will be constrained. The corresponding constraint is also addressed. Moreover, the thermodynamic interpretation of using either a generalized Chaplygin gas or a Chaplygin gas to describe dark energy is also addressed throughout the paper.