The power spectrum of SUSY-CDM on subgalactic scales

Green AM, Hofmann S, Schwarz D (2004)
Monthly Notices of the Royal Astronomical Society 353(3): L23-L27.

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Abstract
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-circle dot 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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Green AM, Hofmann S, Schwarz D. The power spectrum of SUSY-CDM on subgalactic scales. Monthly Notices of the Royal Astronomical Society. 2004;353(3):L23-L27.
Green, A. M., Hofmann, S., & Schwarz, D. (2004). The power spectrum of SUSY-CDM on subgalactic scales. Monthly Notices of the Royal Astronomical Society, 353(3), L23-L27.
Green, A. M., Hofmann, S., and Schwarz, D. (2004). The power spectrum of SUSY-CDM on subgalactic scales. Monthly Notices of the Royal Astronomical Society 353, L23-L27.
Green, A.M., Hofmann, S., & Schwarz, D., 2004. The power spectrum of SUSY-CDM on subgalactic scales. Monthly Notices of the Royal Astronomical Society, 353(3), p L23-L27.
A.M. Green, S. Hofmann, and D. Schwarz, “The power spectrum of SUSY-CDM on subgalactic scales”, Monthly Notices of the Royal Astronomical Society, vol. 353, 2004, pp. L23-L27.
Green, A.M., Hofmann, S., Schwarz, D.: The power spectrum of SUSY-CDM on subgalactic scales. Monthly Notices of the Royal Astronomical Society. 353, L23-L27 (2004).
Green, AM, Hofmann, S, and Schwarz, Dominik. “The power spectrum of SUSY-CDM on subgalactic scales”. Monthly Notices of the Royal Astronomical Society 353.3 (2004): L23-L27.
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