How can heavy neutrinos dominate the universe?

Physics

Scientific paper

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Scientific paper

Heavy neutrinos having a mass of 10 keV or more can take an interesting role in galaxy formation. They can be consistent with the energy density of the present universe if their number density is accordingly small. This is possible even without having lepton flavor-violating neutrino decays if the neutrinos have interactions mediated by light scalars so that they decouple after they become nonrelativistic. We discuss the bounds on the properties of such scalars. A specific model is discussed where these bounds can be realized.

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