New Constraints on "Cool" Dark Matter

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dc.creatorDrees, Manuel
dc.creatorWright, David
dc.date2000-06-23
dc.date.accessioned2026-07-07T03:41:51Z
dc.date.available2026-07-07T03:41:51Z
dc.descriptionIt has been suggested that a sterile neutrino ν_s which mixes with standard neutrinos can form nonthermal ``cool'' Dark Matter if its mass and mixing angle fall in the ranges 0.1 keV \lsim m_s \lsim 10 keV and 10^{-10} \lsim \sin^2 θ\lsim 10^{-4}, respectively. We point out that the required mixing makes these heavy neutrinos unstable. The dominant decay mode is into three light neutrinos, but the most stringent constraint comes from the non-observation of radiative decays into a single light neutrino and a photon. Moreover, we point out that the density of thermal relics of such ν_{s}'s would be too high, unless the reheating temperature after inflation was below \sim 10 GeV.
dc.descriptionLaTeX, 6 pages, one PS figure
dc.identifierhttps://arxiv.org/abs/hep-ph/0006274
dc.identifierhttp://arxiv.org/abs/hep-ph/0006274
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/39719
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.titleNew Constraints on "Cool" Dark Matter
dc.typetext

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