A model for mixed warm and hot right-handed neutrino dark matter

Abstract

We discuss a model where a mixed warm and hot keV neutrino dark matter rises naturally. We arrange active and sterile neutrinos in the same $SU(3{)}_L$ multiplet, with the lightest sterile neutrino being dark matter. The other two heavy sterile neutrinos, through their out-of-equilibrium decay, contribute both to the dilution of dark matter density and its population, after freeze-out. We show that this model features all ingredients to overcome the overproduction of keV neutrino dark matter, and explore the phenomenological implications for Big Bang Nucleosynthesis and the number of relativistic degrees of freedom.

arXiv comment23 pages, 4 figures. References added, matches published version

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• EvoEMD: cosmic evolution with an early matter-dominated era
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• Maximal value for trilinear Higgs coupling in a 3-3-1 EFT
• Exploring the viability of pseudo Nambu-Goldstone boson as ultralight dark matter in a mass range relevant for strong gravity applications
• Confronting the inverse seesaw mechanism with the recent muon g-2 result