Neutrino Fluctuat Nec Mergitur: Are Fossil Neutrinos Detectable?
This is a brief report on work with S.L. Glashow.1 The question is whether light (few eV to ~100 eV) neutrinos, left over from the big bang, are detectable. The answer is, perhaps. If the weak currents of leptons, like those of quarks, are not diagonal in mass eigenstates, a neutrino will decay into a lighter neutrino and a monochromatic photon. The corresponding photon line may be detectable provided: 1) Neutrinos are heavy enough to participate in galaxy clustering, 2) Neutrino lifetimes are, as in some weak interaction models, short enough.
KeywordsNeutrino Mass Radiative Decay Galaxy Cluster Galactic Center Light Neutrino
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