Resonant production of the sterile neutrino dark matter and fine-tunings in the [nu]MSM

Details Resonant production of the sterile neutrino dark matter and fine-tunings in the [nu]MSM Resonant production of the sterile neutrino dark matter and fine-tunings in the [nu]MSM

2010-06-21

arxiv.org/abs/1006.4008v2

Phys.Rev.D82:056014,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 5 figures

Scientific paper

10.1103/PhysRevD.82.056014

The generation of lepton asymmetry below the electroweak scale has a considerable impact on production of dark matter sterile neutrinos. Oscillations or decays of the heavier sterile neutrinos in the neutrino minimal standard model can give rise to the requisite lepton asymmetry, provided the masses of the heavier neutrinos are sufficiently degenerate. We study the renormalization group evolution of the mass difference of these singlet fermions to understand the degree of necessary fine-tuning. We construct an example of the model that can lead to a technically natural realization of this low-energy degeneracy.

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