A redefinition of Hawking temperature on the event horizon: Thermodynamical equilibrium

TL;DR

This paper redefines the Hawking temperature on the event horizon and examines the validity of the generalized second law of thermodynamics and thermodynamic equilibrium in a Friedmann-Robertson-Walker universe, finding the event horizon more realistic in some cases.

Contribution

It introduces a new definition of Hawking temperature on the event horizon and analyzes thermodynamic laws in this context for the first time.

Findings

GSLT and thermodynamic equilibrium can hold on the event horizon.

The universe bounded by the event horizon is more thermodynamically consistent than that by the apparent horizon in some cases.

The redefined temperature impacts the thermodynamic behavior of the universe.

Abstract

In this article we have used the recently introduced redefined Hawking temperature on the event horizon and investigated whether the generalised second law of thermodynamics (GSLT) and thermodynamic equilibrium holds for both the event and the apparent horizons. Here we have considered FRW universe and examined the GSLT and thermodynamic equilibrium with three examples. Finally, we have concluded that from the thermodynamic viewpoint, the universe bounded by the event horizon is more realistic than that by the apparent horizon at least for some examples.