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.
TASI 2014 Lectures: The Hunt for Dark Matter
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abstract
These lectures, given at the 2014 Theoretical Advanced Study Institute (TASI), are an introduction to what we know at present about dark matter and the major current experimental and observational efforts to identify what it consists of. They attempt to present the complexities of the subject, making clear common simplifying assumptions, to better understand the reach of dark matter searches.
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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.