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

Abstract

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.

8 pages, 5 figures

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• The Standard Model Higgs boson as the inflaton
• Sterile neutrinos, dark matter, and the pulsar velocities in models with a Higgs singlet
• A possible symmetry of the $\nu$MSM
• The nuMSM, leptonic asymmetries, and properties of singlet fermions
• Sterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry
• Inflaton mass in the nuMSM inflation

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• On the origin of matter in the Universe
• Freeze-in and freeze-out generation of lepton asymmetries after baryogenesis in the $\nu$MSM
• Low-scale leptogenesis with flavour and CP symmetries
• Confronting the low-scale seesaw and leptogenesis with neutrinoless double beta decay
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Reconciling resonant leptogenesis and baryogenesis via neutrino oscillations
• How many new particles do we need after the Higgs boson?