We carry out a detailed analysis of the supernova (SN) neutrino flavor evolution during the early time accretion phase (post-bounce times tpb≤ 500 ms), characterizing the ν signal by recent SN hydrodynamics simulations. We find that trajectory-dependent “multi-angle” effects associated with the dense ordinary matter suppress collective oscillations induced by the ν−ν interaction in the deepest SN regions.
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