Universal thermodynamics in different gravity theories: Modified entropy on the horizons

TL;DR

This paper explores how universal thermodynamics applies to different gravity theories by modifying the entropy on horizons, maintaining equilibrium conditions in the universe's thermodynamic description.

Contribution

It introduces a modified entropy formulation on horizons that preserves equilibrium thermodynamics across various gravity theories.

Findings

Equilibrium configuration is maintained with modified entropy.

Unified first law holds on the horizon for different gravity theories.

Modified entropy ensures thermodynamic consistency in cosmological models.

Abstract

The paper deals with universal thermodynamics for FRW model of the universe bounded by apparent (or event) horizon. Assuming Hawking temperature on the horizon, the unified first law is examined on the horizon for different gravity theories. The results show that equilibrium configuration is preserved with a modification to Bekenstein entropy on the horizon.