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In astrophysical environments with a large number of neutrinos, such as supernovae, neutrinos exhibit nonlinear flavor oscillations due to interactions with the dense neutrino background. Characterizing the features of these flavor conversions is a difficult problem. The present paper by Taiki Morinaga makes a significant contribution by establishing rigorously the sufficient and necessary conditions under which so-called fast neutrino flavor instabilities arise.
Taiki Morinaga (Mon,) studied this question.