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arXiv · 2004.10766

Sterile neutrino dark matter via coinciding resonances

J. Ghiglieri·M. Laine
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Abstract

It has been proposed that two resonances could coincide in the early universe at temperatures $T \sim 0.2 ... 0.5$ GeV: one between two nearly degenerate GeV-scale sterile neutrinos, producing a large lepton asymmetry through freeze-out and decays; another between medium-modified active neutrinos and keV-scale sterile neutrinos, converting the lepton asymmetry into dark matter. Making use of a framework which tracks three sterile neutrinos of both helicities as well as three separate lepton asymmetries, and scanning the parameter space of the GeV-scale species, we establish the degree of fine-tuning that is needed for realizing this scenario.

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J. Ghiglieri, M. Laine. 2020-07-07. Sterile neutrino dark matter via coinciding resonances. https://doi.org/10.1088/1475-7516%2F2020%2F07%2F012

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