Sterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry

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dc.creatorLaine, M.
dc.creatorShaposhnikov, M.
dc.date2008-04-29
dc.date2008-06-29
dc.date.accessioned2026-07-07T12:24:14Z
dc.date.available2026-07-07T12:24:14Z
dc.descriptionIt has been pointed out in ref.[1] that in the nuMSM (Standard Model extended by three right-handed neutrinos with masses smaller than the electroweak scale), there is a corner in the parameter space where CP-violating resonant oscillations among the two heaviest right-handed neutrinos continue to operate below the freeze-out temperature of sphaleron transitions, leading to a lepton asymmetry which is considerably larger than the baryon asymmetry. Consequently, the lightest right-handed (``sterile'') neutrinos, which may serve as dark matter, are generated through an efficient resonant mechanism proposed by Shi and Fuller [2]. We re-compute the dark matter relic density and non-equilibrium momentum distribution function in this situation with quantum field theoretic methods and, confronting the results with existing astrophysical data, derive bounds on the properties of the lightest right-handed neutrinos. Our spectra can be used as an input for structure formation simulations in warm dark matter cosmologies, for a Lyman-alpha analysis of the dark matter distribution on small scales, and for studying the properties of haloes of dwarf spheroidal galaxies.
dc.description25 pages. v2: many clarifications and references added; published version
dc.identifierhttps://arxiv.org/abs/0804.4543
dc.identifierhttp://arxiv.org/abs/0804.4543
dc.identifierJCAP 0806:031,2008
dc.identifierdoi:10.1088/1475-7516/2008/06/031
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214258
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleSterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry
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