Sterile Neutrino Dark Matter: Case Advanced

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The paper advances the case for sterile neutrinos as a dark matter candidate, suggesting a connection to unresolved discrepancies in current models. However, concerns are raised about the viability of the eV-scale sterile neutrino as a sufficient dark matter candidate due to its relatively low mass. The discussion highlights the possibility that a heavier sterile neutrino might be necessary to fulfill dark matter requirements. Additionally, the existence of multiple sterile neutrino species is noted, with only two types currently proposed: one around 1 eV and another in the keV range. Overall, the conversation emphasizes the need for further clarification on the role of eV-scale sterile neutrinos in dark matter theories.
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This paper, http://arxiv.org/abs/1404.6160, advances the case for sterile neutrinos as a dark matter candidate.
 
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Thanks for posting this. Correct me if I'm wrong, but I don't think the eV-scale sterile neutrino proposed here is heavy enough to be a dark matter candidate. Is the thinking that the eV-scale sterile neutrino resolves the discrepancies discussed in this paper and a heavier sterile neutrino is a dark matter candidate, or am I missing the point? Presumably if there are sterile neutrinos, there are at lest three of them.
 
AFAIK only two species of sterile neutrinos have been proposed. One being the ~ 1 ev variety and the other in the kev range. The ~1 ev mass neutrino discussed in this paper would only constitute a modest fraction of the total DM mass budget.
 

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