Mass Power Spectrum in a Universe Dominated by the Chaplygin Gas

Details Mass Power Spectrum in a Universe Dominated by the Chaplygin Gas Mass Power Spectrum in a Universe Dominated by the Chaplygin Gas

2002-03-25

arxiv.org/abs/astro-ph/0203441v1

Gen.Rel.Grav. 34 (2002) 2111-2126

Astronomy and Astrophysics

Astrophysics

Latex file, 14 pages, 5 figures

Scientific paper

The mass power spectrum for a Universe dominated by the Chaplygin gas is evaluated numerically from scales of the order of the Hubble horizon to 100 Mpc. The results are compared with a pure baryonic Universe and a cosmological constant model. In all three cases, the spectrum increases with k, the wavenumber of the perturbations. The slope of the spectrum is higher for the baryonic model and smaller for the cosmological constant model, the Chaplygin gas interpolating these two models. The results are analyzed in terms of the sound velocity of the Chaplygin gas and the moment the Universe begins to accelerate.

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