Degenerate Fermi gas perturbations at standard background cosmology

Details Degenerate Fermi gas perturbations at standard background cosmology Degenerate Fermi gas perturbations at standard background cosmology

2010-12-20

arxiv.org/abs/1012.4500v2

JCAP 01 (2011) 10

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

20 pages, 4 figures

Scientific paper

10.1088/1475-7516/2011/01/010

The hypothesis of a tiny fraction of the cosmic inventory evolving cosmologically as a degenerate Fermi gas test fluid at some dominant cosmological background is investigated. Our analytical results allow for performing preliminary computations to the evolution of perturbations for relativistic and non-relativistic test fluids. The density fluctuation, $\delta$, the fluid velocity divergence, $\theta$, and an explicit expression for the dynamics of the shear stress, $\sigma$, are obtained for a degenerate Fermi gas in the background regime of radiation. Extensions to the dominance of matter and to the $\Lambda$CDM cosmological background are also investigated and lessons concerning the formation of large structures of degenerate Fermi gas are depicted.

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