General relativistic nonideal fluid equations for dark matter from a truncated cumulant expansion

• Verfasst von: Erschfeld, Alaric [VerfasserIn]
• Verfasst von: Flörchinger, Stefan [VerfasserIn]
• Verfasst von: Rupprecht, Maximilian [VerfasserIn]
• Titel: General relativistic nonideal fluid equations for dark matter from a truncated cumulant expansion
• Verf.angabe: Alaric Erschfeld, Stefan Floerchinger, and Maximilian Rupprecht
• E-Jahr: 2020
• Jahr: 16 September 2020
• Umfang: 11 S.
• Fussnoten: Gesehen am 26.10.2020
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2020
• Band/Heft Quelle: 102(2020,6) Artikel-Nummer 063520, 11 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.102.063520
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1736629182

Abstract

A new truncation scheme based on the cumulant expansion of the one-particle phase-space distribution function for dark matter particles is developed. Extending the method of moments in relativistic kinetic theory, we derive evolution equations which supplement the covariant conservation of the energy-momentum tensor and particle number current. Truncating the cumulant expansion we obtain a closed, covariant and hyperbolic system of equations which can be used to model the evolution of a general relativistic nonideal fluid. As a working example we consider a Friedmann-Lemaître-Robertson-Walker cosmology with dynamic pressure and solve for the time evolution of the effective equation of state parameter.