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    Phys Rev Lett. 2006 Nov 10;97(19):191303. Epub 2006 Nov 8.

    Can sterile neutrinos be the dark matter?

    Seljak U, Makarov A, McDonald P, Trac H.

    Source

    International Center for Theoretical Physics, Trieste, Italy.

    Abstract

    We use the Ly-alpha forest power spectrum measured by the Sloan Digital Sky Survey and high-resolution spectroscopy observations in combination with cosmic microwave background and galaxy clustering constraints to place limits on a sterile neutrino as a dark matter candidate in the warm dark matter scenario. Such a neutrino would be created in the early Universe through mixing with an active neutrino and would suppress structure on scales smaller than its free-streaming scale. We ran a series of high-resolution hydrodynamic simulations with varying neutrino masses to describe the effect of a sterile neutrino on the Ly-alpha forest power spectrum. We find that the mass limit is m(s) >13 keV at 95% C.L. (9 keV at 99.9%), which is above the upper limit allowed by x-ray constraints, excluding this candidate from being all of the dark matter in this model.

    PMID:
    17155611
    [PubMed]

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