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The simplest model that can accommodate a viable nonbaryonic dark matter candidate is the standard electroweak theory with the addition of right-handed (sterile) neutrinos. We consider a single generation of neutrinos with a Dirac mass and a Majorana mass M for the right-handed component. If M (standard hot dark matter corresponds to M=0), then sterile neutrinos are produced via oscillations in the early Universe with energy density independent of M. However, M is crucial in determining the large scale structure of the Universe; for M100 eV, sterile neutrinos make an excellent warm dark matter candidate.
Dodelson et al. (Mon,) studied this question.
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