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By G. L. Fogli, E. Lisi, A. Marrone and A. Mirizzi


In core-collapse supernovae, ν and ν are initially subject to significant selfinteractions induced by weak neutral currents, which may induce strong-coupling effects on the flavor evolution (collective transitions). The interpretation of the effects is simplified when self-induced collective transitions are decoupled from ordinary matter oscillations, as for the matter density profile that we discuss. In this case, approximate analytical tools can be used (pendulum analogy, swap of energy spectra). For inverted ν mass hierarchy, the sequence of effects involves: synchronization, bipolar oscillations, and spectral split. Our simulations shows that the main features of these regimes are not altered when passing from simplified (angle-averaged) treatments to full, multi-angle numerical experiments. Densely packed inviduals often show a surprising, collective behavior (Fig. 1). Recent developments suggest that neutrinos make no exception, despite the weakness of their self-interactions. Effects of ν-ν forward scattering (via neutral currents) may be as important as the known effects of νe-e − forward scattering in matter (vi

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