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Massive sterile neutrinos as warm Dark Matter
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We show that massive sterile neutrinos mixed with the ordinary ones may be produced in the early universe in the right amount to be natural warm dark matter particles. Their mass should be below 40 keV and the corresponding mixing angles sin^2 2\theta > 10^{-11} for mixing with \nu_\mu or \nu_\tau, while mixing with \nu_e is slightly stronger bounded with mass less than 30 keV.
Forward citations
Cited by 3 Pith papers
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High resolution Lyman-{\alpha} forest constraints on dark matter-neutrino scattering
The Lyman-alpha forest constrains dark matter-neutrino scattering to u_nu_chi < 1.5e-8 (95% C.L.), excluding previously claimed hints of a non-zero interaction.
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Multiple Populations of Same Sterile Neutrino as Dark Matter
A single sterile neutrino species can be produced by multiple early-universe mechanisms, yielding cold and warm dark matter populations with a two-humped momentum spectrum.
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Long-lived sterile neutrinos from axionlike particles at the Super Tau-Charm Facility
STCF can reach |V_eN|^2 values one to two orders of magnitude below current bounds for heavy neutral leptons via displaced-vertex searches from ALP decays in D-meson production.
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