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Combining collective, MSW, and turbulence effects in supernova neutrino flavor evolution

Combining collective, MSW, and turbulence effects in supernova neutrino flavor evolution

Physical Review D 88(2): 023008

(Abridged) In order to decode the neutrino burst signal from a Galacticcore-collapse supernova and reveal the complicated inner workings of theexplosion we need a thorough understanding of the neutrino flavor evolutionfrom the proto-neutron star outwards. The flavor content of the signal evolvesdue to both neutrino collective effects and matter effects which can lead to ahighly interesting interplay and distinctive spectral features. In this paperwe investigate the supernova neutrino flavor evolution in three differentprogenitors and include collective flavor effects, the evolution of theMikheyev, Smirnov & Wolfenstein conversion due to the shock wave passagethrough the star, and the impact of turbulence. In the Oxygen-Neon-Magnesiumsupernova we find that the impact of turbulence is both brief and slight duringa window of 1-2 seconds post bounce. Thus the spectral features of collectiveand shock effects in the neutrino signals from ONeMg supernovae may be almostturbulence free making them the easiest to interpret. For the more massiveprogenitors we again find that small amplitude turbulence, up to 10%, leads toa minimal modification of the signal, and the emerging neutrino spectra retainboth collective and MSW features. However, when larger amounts of turbulence isadded, 30% and 50%, the features of collective and shock wave effects in thehigh density resonance channel are almost completely obscured at late times.Yet at the same time we find the other mixing channels - the low densityresonance channel and the non-resonant channels - begin to develop turbulencesignatures. Large amplitude turbulent motions in the outer layers of moremassive, iron core-collapse supernovae may obscure the most obviousfingerprints of collective and shock wave effects in the neutrino signal butcannot remove them completely, and additionally bring about new features in thesignal.

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Accession: 036863835

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DOI: 10.1103/PhysRevD.88.023008

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