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People sometimes talk about KeV mass sterile neutrinos as a warm dark matter candidate. I think they call them KeVins (horrible name btw). Now, In order for it to be a good dark matter candidate it must be quasi-stable, so the mixing with active neutrinos must be quite small. Can anybody give me the upper bound on the active-sterile mixing? Thanks

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    $\begingroup$ "I think they call them KeVins (horrible name btw)." Egads, that is bad. $\endgroup$ – dmckee Jul 30 '14 at 23:54

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