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Particle Models and...
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Bringmann, TorstenStockholms universitet,Fysikum,The Oskar Klein Centre for Cosmoparticle Physics
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Particle Models and the Small-Scale Structure of Dark Matter
- Artikel/kapitelEngelska2009
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2009-10-16
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IOP Publishing,2009
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LIBRIS-ID:oai:DiVA.org:su-32505
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-32505URI
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https://doi.org/10.1088/1367-2630/11/10/105027DOI
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Språk:engelska
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Sammanfattning på:engelska
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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.
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Stockholms universitetFysikum
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Ingår i:New Journal of Physics: IOP Publishing11, s. 105027-1367-2630
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