Cosmological Perturbation Theory for streams of relativistic particles - Archive ouverte HAL Access content directly
Journal Articles Journal of Cosmology and Astroparticle Physics Year : 2015

Cosmological Perturbation Theory for streams of relativistic particles

(1) , (1)
1

Abstract

Motion equations describing streams of relativistic particles and their properties are explored in detail in the framework of Cosmological Perturbation Theory. Those equations , derived in any metric both in the linear and nonlinear regimes, express the matter and momentum conservation. In this context we extend the setup of adiabatic initial conditions that was initially performed in the conformal Newtonian gauge-to the synchronous gauge. The subhorizon limit of the nonlinear motion equations written in a generic perturbed Friedmann-Lemaître metric is then derived and analyzed. We show in particular that the momentum field P i (x) is always potential in the linear regime and remains so at subhorizon scales in the nonlinear regime. Finally the equivalence principle is exploited to highlight in-variance properties satisfied by such a system of equations, extending that known for streams of non-relativistic particles, namely the extended Galilean invariance.
Fichier principal
Vignette du fichier
publi.pdf (646.5 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

cea-01184657 , version 1 (17-08-2015)

Identifiers

Cite

Hélène Dupuy, Francis Bernardeau. Cosmological Perturbation Theory for streams of relativistic particles. Journal of Cosmology and Astroparticle Physics, 2015, 030, pp.1475. ⟨10.1088/1475-7516/2015/03/030⟩. ⟨cea-01184657⟩
126 View
93 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More