Photon gas in a finite box: thermodynamics and finite size effects

TL;DR

This paper investigates the thermodynamics of a photon gas confined in a finite cuboid cavity, deriving general relations and analyzing finite size effects from first principles.

Contribution

It introduces a theoretical framework for photon gas thermodynamics in finite systems and discusses novel finite size effects.

Findings

Finite size effects significantly alter thermodynamic properties.

Derived general thermodynamic relations for finite photon gases.

Calculated thermodynamic functions for a cuboid cavity from first principles.

Abstract

Thermodynamic properties of a photon gas in a small box are explored taking into account finite size effects. General thermodynamic relations are derived for this finite system. Photon gas thermodynamic functions are calculated for the case of cuboid cavity on the basis of first principles. New finite size effects are discussed.