Particle number density fluctuations and pressure effects on structure formation

Details Particle number density fluctuations and pressure effects on structure formation Particle number density fluctuations and pressure effects on structure formation

2000-08-02

arxiv.org/abs/astro-ph/0008039v2

Class.Quant.Grav. 18 (2001) 3917-3928

Astronomy and Astrophysics

Astrophysics

10 pages Revtex; revised to match published version

Scientific paper

10.1088/0264-9381/18/18/310

We provide a covariant and gauge-invariant approach to the question of how a first order pressure can be incorporated self-consistently in a cosmological scenario. The approximation is relevant, in the linear regime, to weakly self-interacting or warm dark matter models. We also derive number density fluctuations in which new modes appear because the number density fluctuations are no longer simply proportional to the density fluctuations.

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