How is affected the thermodynamic description of physical systems when gravity is incorporated?

TL;DR

This paper explores how incorporating gravity into thermodynamic descriptions alters system properties, revealing entropy-area proportionality for light in extreme states, consistent with the holographic principle.

Contribution

It provides a revised understanding of thermodynamics under gravity, linking microstate constraints to the holographic principle and entropy behavior.

Findings

Entropy of light in extreme states is proportional to area.

Gravity constrains microstates, reducing degrees of freedom.

Results align with the holographic principle.

Abstract

This research is aimed at the revision of the thermodynamic concepts and their relationship with the General Relativity Theory (GRT) and how physical systems are affected when gravity is included in their thermodynamic description. We found that in the case of light, the entropy in an extreme stage is proportional to the area. This is due to a reduction of freedom degrees of the system, since gravity imposes constraint on the number of microstates which are accessible to the system and this is consistent with the holographic principle.