Relaxation for massive particles: transport and causality

Bajec, Matej (author), Soloviev, Alexander (author)

Correlators at finite density and temperature encode important information about a physical system, such as transport and causality. For a massive gas of particles in the relaxation time approximation of kinetic theory, we provide complete analytic results for all first order transport coefficients, including thermoelectric coefficients. We demonstrate the first complete picture of the complex structure of the correlators as a function of mass, providing an interpretation in terms of the causal structure of light cones. We provide a simple criterion to extract the effective light cone velocity from the cut of the retarded correlator.

• Language: English
• Keywords: relativistic hydrodynamics, kinetic theory, transport phenomena
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: Str. 065002-1-065002-20
• Numbering: Vol. 112, iss. 6
• PID: 20.500.12556/RUL-175210
• UDC: 532/533
• ISSN on article: 2470-0010
• DOI: 10.1103/v4tj-fj5k
• COBISS.SI-ID: 254125315
• Publication date in RUL: 21.10.2025

Record is a part of a journal

• Title: Physical review
• Shortened title: Phys. rev., D
• Publisher: American Physical Society
• ISSN: 2470-0010
• COBISS.SI-ID: 29757223

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: relativistična hidrodinamika, kinetična teorija, transportni pojavi