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Particle Models and the Small-Scale Structure of Dark Matter
Stockholm University, Faculty of Science, Department of Physics. (The Oskar Klein Centre for Cosmoparticle Physics)
2009 (English)In: New Journal of Physics, ISSN 1367-2630, Vol. 11, 105027- p.Article in journal (Refereed) Published
Abstract [en]

The kinetic decoupling of weakly interacting massive particles (WIMPs) in the early universe sets a scale that can directly be translated into a small-scale cutoff in the spectrum of matter density fluctuations. The formalism presented here allows a precise description of the decoupling process and thus the determination of this scale to a high accuracy from the details of the underlying WIMP microphysics. With decoupling temperatures of several MeV to a few GeV, the smallest protohalos to be formed range between 10^{-11} and almost 10^{-3} solar masses -- a somewhat smaller range than what was found earlier using order-of-magnitude estimates for the decoupling temperature; for a given WIMP model, the actual cutoff mass is typically about a factor of 10 greater than derived in that way, though in some cases the difference may be as large as a factor of several 100. Observational consequences and prospects to probe this small-scale cutoff, which would provide a fascinating new window into the particle nature of dark matter, are discussed.

Place, publisher, year, edition, pages
2009. Vol. 11, 105027- p.
National Category
Subatomic Physics
Research subject
URN: urn:nbn:se:su:diva-32505DOI: 10.1088/1367-2630/11/10/105027ISI: 000271033500025OAI: diva2:280763
Available from: 2010-01-25 Created: 2009-12-11 Last updated: 2010-01-25Bibliographically approved

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