Self-induced spectral splits in supernova neutrino fluxes

摘要: In the dense-neutrino region above neutrino sphere of a supernova (r < or approx. 400 km), neutrino-neutrino refraction causes collective flavor transformations. They can lead to 'spectral splits' where an energy E{sub split} splits transformed spectrum sharply into parts almost pure but different flavors. Unless there is ordinary MSW resonance in region, determined by flavor-lepton number conservation alone. Spectral are created adiabatic transition between regions large and small density. We solve equations motion limit explicitly provide analytic expressions for generic example.