The power spectrum of SUSY-CDM on subgalactic scales
In: Monthly Notices of the Royal Astronomical Society, Jg. 353 (2004), Heft 3, S. L23- (5S.)
Online
academicJournal
- print, 39 ref
Zugriff:
The formation of large-scale structure is independent of the nature of the cold dark matter (CDM), however the fate of very small-scale inhomogeneities depends on the microphysics of the CDM particles. We investigate the matter power spectrum for scales that enter the Hubble radius well before matter-radiation equality, and follow its evolution until the time when the first inhomogeneities become non-linear. Our focus lies on weakly interacting massive particles (WIMPs), and as a concrete example we analyse the case when the lightest supersymmetric particle is a bino. We show that collisional damping and free-streaming of WIMPs lead to a matter power spectrum with a sharp cut-off at about 10-6 M○. and a maximum close to that cut-off. We also calculate the transfer function for the growth of the inhomogeneities in the linear regime. These three effects (collisional damping, free-streaming and gravitational growth) are combined to provide a WMAP normalized primordial CDM power spectrum, which could serve as an input for high-resolution CDM simulations. The smallest inhomogeneities typically enter the non-linear regime at a redshift of about 60.
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The power spectrum of SUSY-CDM on subgalactic scales
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Autor/in / Beteiligte Person: | GREEN, Anne M ; HOFMANN, Stefan ; SCHWARZ, Dominik J |
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Zeitschrift: | Monthly Notices of the Royal Astronomical Society, Jg. 353 (2004), Heft 3, S. L23- (5S.) |
Veröffentlichung: | Oxford: Blackwell Science, 2004 |
Medientyp: | academicJournal |
Umfang: | print, 39 ref |
ISSN: | 0035-8711 (print) |
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