Evidence for "sterile neutrino" dark matter?

Details Evidence for "sterile neutrino" dark matter? Evidence for "sterile neutrino" dark matter?

1998-08-17

arxiv.org/abs/hep-ph/9808343v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk presented at the Ringberg Euroconference "New Trends in Neutrino Physics", Ringberg Castle, Tegernsee, Germany, 24-29 May

Scientific paper

I show that it may be possible to explain the present evidence for a gamma-ray emission from the galactic halo as due to halo WIMP annihilations. Not only the intensity and spatial pattern of the halo emission can be matched but also the relic density of the candidate WIMP can be in the cosmologically interesting domain. After a model-independent analysis to learn about the properties of a suitable candidate, I present a working model: a sterile neutrino in a model with an extended Higgs sector. Two examples indicate the existence of an interesting region in the model parameter space where present observational and experimental constraints are satisfied and the gamma-ray emission is reproduced.

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