Singularity softening and avoidance by the action of thermal radiation in a generalized entropic cosmology

TL;DR

This paper explores how thermal radiation influences singularity behavior in a generalized entropic cosmology, potentially softening or avoiding Big Rip singularities in a viscous dark fluid model.

Contribution

It introduces the impact of Hawking radiation effects on singularity formation within a new generalized entropic cosmology framework.

Findings

Thermal effects can change the type of Big Rip singularity.

Thermal radiation can lead to the complete disappearance of singularities.

A qualitative shift towards less severe singularities is observed.

Abstract

Some relevant aspects of a new form of generalized entropic cosmology, recently introduced by Nojiri, Odintsov and Faraoni, are considered. The setup is a logarithmic equation of state for a viscous dark fluid coupled with dark matter, in the ordinary Friedmann-Lema\^itre-Robertson-Walker flat universe. The influence of thermal effects, caused by Hawking radiation, near the singularity, are carefully investigated. In particular, their role on the formation and specific type of the Big Rip expected to occur within a finite time. It is shown that a scenario arises, where a qualitative change towards the good direction, in the type of the singularity formed, does occur. On top of that, another very interesting scenario is obtained, where the singularity vanishes completely.