Thermodynamic aspects of entropic cosmology with viscosity

TL;DR

This paper explores the evolution of the universe using thermodynamic principles with Tsallis entropy and incorporates bulk viscosity into the cosmic fluid, providing a unified description of early and late universe dynamics.

Contribution

It introduces the use of generalized Tsallis entropy with a variable exponent and includes bulk viscosity in cosmological modeling, which is a novel approach.

Findings

Unified thermodynamic description of early and late universe.

Impact of bulk viscosity on cosmic evolution.

Application of non-extensive entropy in cosmology.

Abstract

We describe the evolution of the early and late universe from thermodynamic considerations, using the generalized non-extensive Tsallis entropy with a variable exponent. A new element in our analysis is the inclusion of a bulk viscosity in the description of the cosmic fluid. Using the generalized Friedmann equation, a description of the early and the late universe is obtained.