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The generation of lepton asymmetry below the electroweak scale has aconsiderable impact on production of dark matter sterile neutrinos.Oscillations or decays of the heavier sterile neutrinos in the neutrino minimalstandard model can give rise to the requisite lepton asymmetry, provided themasses of the heavier neutrinos are sufficiently degenerate. We study therenormalization group evolution of the mass difference of these singletfermions to understand the degree of necessary fine-tuning. We construct anexample of the model that can lead to a technically natural realization of thislow-energy degeneracy.

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