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A Fresh Look at keV Sterile Neutrino Dark Matter from Frozen-In Scalars
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A Fresh Look at keV Sterile Neutrino Dark Matter from Frozen-In Scalars
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Sterile neutrinos with a mass of a few keV can serve as cosmological warm dark matter. We study the production of keV sterile neutrinos in the early universe from the decay of a frozen-in scalar. Previous studies focused on heavy frozen-in scalars with masses above the Higgs mass leading to a hot spectrum for sterile neutrinos with masses below 8-10 keV. Motivated by the recent hints for an X-ray line at 3.55 keV, we extend the analysis to lighter frozen-in scalars, which allow for a cooler spectrum. Below the electroweak phase transition, several qualitatively new channels start contributing. The most important ones are annihilation into electroweak vector bosons, particularly W-bosons as well as Higgs decay into pairs of frozen-in scalars when kinematically allowed.
Forward citations
Cited by 2 Pith papers
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Sterile neutrino Dark Matter in the minimal Dirac Seesaw
A minimal Dirac seesaw model yields viable sterile-neutrino dark matter via freeze-in, with the right-handed mixing angle θ_R bypassing X-ray bounds.
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Sterile Neutrino Dark Matter as a Probe of Inflationary Reheating
Inflaton decays during reheating can produce all of the observed sterile-neutrino dark matter with a branching ratio below 10^-4, evading X-ray bounds and making a future X-ray line a probe of the inflaton mass and re...
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