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We revisit our previous results on the matter suppression of self-inducedneutrino flavor conversions during a supernova (SN) accretion phase, performinga linearized stability analysis of the neutrino equations of motion, in thepresence of realistic SN density profiles. In our previous numerical study, weused a simplified model based on an isotropic neutrino emission with a singletypical energy. Here, we take into account realistic neutrino energy and angledistributions. We find that multi-energy effects have a sub-leading impact inthe flavor stability of the SN neutrino fluxes with respect to our previoussingle-energy results. Conversely, realistic forward-peaked neutrino angulardistributions would enhance the matter suppression of the self-inducedoscillations with respect to an isotropic neutrino emission. As a result, inour models for iron-core SNe, collective flavor conversions have a negligibleimpact on the characterization of the observable neutrino signal during theaccretion phase. Instead, for a low-mass O-Ne-Mg core SN model, with lowermatter density profile and less forward-peaked angular distributions,collective conversions are possible also at early times.

Stability analysis of collective neutrino oscillations in the supernova accretion phase with realistic energy and angle distributions