Elementary considerations on possible entropy-driven cosmological evolutions

TL;DR

This paper explores how entropy production influences cosmological evolution, demonstrating that certain entropy sources can lead to a stable universe resembling a cosmological constant, within a non-equilibrium framework.

Contribution

It introduces a new non-equilibrium cosmological model analyzing entropy sources and their role in driving universe dynamics and stability.

Findings

Entropy sources can induce effective cosmological constant behavior.

The system's stability depends on the form of entropy production.

Constraints on entropic forces are derived from stability analysis.

Abstract

For several independent reasons, the idea that notorious sources of entropy could exist in the Universe has been recently revived. Taking advantage of a new framework accounting for non-equilibrium processes in cosmology, we explicitly investigate the cosmological dynamics as a function of the entropy production, focusing on the stability of the system. An exhaustive investigation is performed. As the main physical conclusion, we show that for a wide class of entropy source terms, the fluid dynamics converges towards an effective cosmological constant. Constraints on the associated entropic force are also obtained.