Constraining sterile neutrino dark matter by phase-space density observations

Details Constraining sterile neutrino dark matter by phase-space density observations Constraining sterile neutrino dark matter by phase-space density observations

2008-08-28

arxiv.org/abs/0808.3910v2

JCAP 0810:041,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages; replaced with journal version

Scientific paper

10.1088/1475-7516/2008/10/041

We apply phase-space density considerations to obtain lower bounds on the mass of sterile neutrino as dark matter candidate. The bounds are different for non-resonant production, resonant production in the presence of lepton asymmetry and production in decays of heavier particles. In the former case our bound is comparable to, but independent of the Lyman-alpha bound, and together with X-ray upper limit it disfavors non-resonantly produced sterile neutrino dark matter. An interesting feature of the latter case is that warm dark matter may be composed of heavy particles.

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