Thermodynamical description of the interaction between holographic dark energy and dark matter

TL;DR

This paper models the interaction between holographic dark energy and dark matter using thermodynamics, showing that small interactions can be viewed as thermal fluctuations, leading to a physically consistent and observationally viable description.

Contribution

It introduces a thermodynamic framework for dark energy-dark matter interaction, incorporating thermal fluctuations and entropy corrections, aligning with phenomenological models and observations.

Findings

Interaction modeled as thermal fluctuation with entropy correction

Model consistent with observational data

Provides a thermodynamic basis for dark energy-dark matter interaction

Abstract

We present a thermodynamical description of the interaction between holographic dark energy and dark matter. If holographic dark energy and dark matter evolve separately, each of them remains in thermodynamic equilibrium. A small interaction between them may be viewed as a stable thermal fluctuation that brings a logarithmic correction to the equilibrium entropy. From this correction we obtain a physical expression for the interaction which is consistent with phenomenological descriptions and passes reasonably well the observational tests.