Inert-Sterile Neutrino: Cold or Warm Dark Matter Candidate

Details Inert-Sterile Neutrino: Cold or Warm Dark Matter Candidate Inert-Sterile Neutrino: Cold or Warm Dark Matter Candidate

2009-12-14

arxiv.org/abs/0912.2478v2

Phys.Rev.D81:063529,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures; version 2: small changes in the text and references added

Scientific paper

10.1103/PhysRevD.81.063529

In usual particle models, sterile neutrinos can account for the dark matter of the Universe only if they have masses in the keV range and are warm dark matter. Stringent cosmological and astrophysical bounds, in particular imposed by X-ray observations, apply to them. We point out that in a particular variation of the inert doublet model, sterile neutrinos can account for the dark matter in the Universe and may be either cold or warm dark matter candidates, even for masses much larger than the keV range. These Inert-Sterile neutrinos, produced non-thermally in the early Universe, would be stable and have very small couplings to Standard Model particles, rendering very difficult their detection in either direct or indirect dark matter searches. They could be, in principle, revealed in colliders by discovering other particles in the model.

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