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Neutrino-neutrino interactions, as mediated by standard model Z exchange, candrastically enhance the Dodelson-Widrow mechanism for the production of sterileneutrinos in the region of temperature $5-15$MeV. For a sterile mass in the KeVregion with the usual type of active-sterile neutrino coupling, the productioncan be copious enough to provide ample dark matter, even when theactive-sterile coupling is small enough to avoid the bounds set by laboratoryresults.

Neutrino collective effects and sterile neutrino production in the early universe