Power Spectra for Cold Dark Matter and its Variants

Details Power Spectra for Cold Dark Matter and its Variants Power Spectra for Cold Dark Matter and its Variants

1997-10-23

arxiv.org/abs/astro-ph/9710252v1

Astrophys.J. 511 (1997) 5

Astronomy and Astrophysics

Astrophysics

20 pages, LaTeX, 4 figures. Submitted to ApJ. Electronic versions of the fitting formula, as well as simple codes to output co

Scientific paper

10.1086/306640

The bulk of recent cosmological research has focused on the adiabatic cold dark matter model and its simple extensions. Here we present an accurate fitting formula that describes the matter transfer functions of all common variants, including mixed dark matter models. The result is a function of wavenumber, time, and six cosmological parameters: the massive neutrino density, number of neutrino species degenerate in mass, baryon density, Hubble constant, cosmological constant, and spatial curvature. We show how observational constraints---e.g. the shape of the power spectrum, the abundance of clusters and damped Lyman-alpha systems, and the properties of the Lyman-alpha forest--- can be extended to a wide range of cosmologies, including variations in the neutrino and baryon fractions in both high-density and low-density universes.

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