Work

Relativistic transformation of temperature

Year: 2026

Type: article

Abstract: We reconsider the long standing problem of the transformation of temperature in special relativity. Using the radiation field as a working system, we show that there is no unique law of transformation. Indeed, the moving system appears hotter than the system at rest. This transformation law clearly depends on the thermodynamic quantity under study. Contrary to temperature, pressure can be Lorentz invariant, depending on the axis of observation. Moreover, entropy, photon number, and sound speed are Lorentz invariant. This is the principal result of this work.

Source: AIP Advances

DOI: 10.1063/5.0350331

Author: Gérald Faussurier

Institutions: Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, CEA DAM Île-de-France, Laboratoire Matière en Conditions Extrêmes

Language: English

Topic: Relativity and Gravitational Theory

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,350

OpenAlex ID: W7204933506