Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-23
Mon.Not.Roy.Astron.Soc.353:L23,2004
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures; effect of baryons on (linear) small-scale cdm-structure included, references updated
Scientific paper
10.1111/j.1365-2966.2004.08232.x
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 micro-physics 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 analyze 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_odot 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.
Green Anne M.
Hofmann Stefan
Schwarz Dominik J.
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