Modified Cosmology Models from Thermodynamical Approach

TL;DR

This paper explores modified cosmological models derived from thermodynamics using power-law corrected and Tsallis entropies, analyzing their implications on cosmological parameters and neutrino mass bounds.

Contribution

It introduces a thermodynamical approach to cosmology with non-standard entropies and performs the first numerical analysis of their effects on cosmological observables.

Findings

Neutrino mass sum has a non-zero central value in the Tsallis entropy model.

Relaxed upper bounds on neutrino mass compared to $b1$CDM.

Power-law corrected entropy impacts cosmological parameter estimates.

Abstract

We apply the first law of thermodynamics to the apparent horizon of the universe with the power-law corrected and non-extensive Tsallis entropies rather than the Bekenstein-Hawking one. We examine the cosmological properties in the two entropy models by using the CosmoMC package. In particular, the first numerical study for the cosmological observables with the power-law corrected entropy is performed. We also show that the neutrino mass sum has a non-zero central value with a relaxed upper bound in the Tsallis entropy model comparing with that in the $\Lambda$CDM one.