Dark-matter sterile neutrinos in models with a gauge singlet in the Higgs sector

Details Dark-matter sterile neutrinos in models with a gauge singlet in the Higgs sector Dark-matter sterile neutrinos in models with a gauge singlet in the Higgs sector

2007-11-29

arxiv.org/abs/0711.4646v3

Phys.Rev.D77:065014,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 7 figures

Scientific paper

10.1103/PhysRevD.77.065014

Sterile neutrino with mass of several keV can be the cosmological dark matter, can explain the observed velocities of pulsars, and can play an important role in the formation of the first stars. We describe the production of sterile neutrinos in a model with an extended Higgs sector, in which the Majorana mass term is generated by the vacuum expectation value of a gauge-singlet Higgs boson. In this model the relic abundance of sterile neutrinos does not necessarily depend on their mixing angles, the free-streaming length can be much smaller than in the case of warm dark matter produced by neutrino oscillations, and, therefore, some of the previously quoted bounds do not apply. The presence of the gauge singlet in the Higgs sector has important implications for the electroweak phase transition, baryogenesis, and the upcoming experiments at the Large Hadron Collider and a Linear Collider.

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