title: Can sterile neutrinos be the dark matter?
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.
authors.affiliation: International Center for Theoretical Physics, Trieste, Italy.
authors.forename: Uros
authors.initials: U
authors.lastname: Seljak
authors.forename: Alexey
authors.initials: A
authors.lastname: Makarov
authors.forename: Patrick
authors.initials: P
authors.lastname: McDonald
authors.forename: Hy
authors.initials: H
authors.lastname: Trac