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Fast neutrino flavor conversions near the supernova core with realistic flavor-dependent angular distributions

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Published 10 February 2017 © 2017 IOP Publishing Ltd and Sissa Medialab srl
, , Citation Basudeb Dasgupta et al JCAP02(2017)019DOI 10.1088/1475-7516/2017/02/019

1475-7516/2017/02/019

Abstract

It has been recently pointed out that neutrino fluxes from a supernova can show substantial flavor conversions almost immediately above the core. Using linear stability analyses and numerical solutions of the fully nonlinear equations of motion, we perform a detailed study of these fast conversions, focussing on the region just above the supernova core. We carefully specify the instabilities for evolution in space or time, and find that neutrinos travelling towards the core make fast conversions more generic, i.e., possible for a wider range of flux ratios and angular asymmetries that produce a crossing between the zenith-angle spectra of νe and bar nue. Using fluxes and angular distributions predicted by supernova simulations, we find that fast conversions can occur within tens of nanoseconds, only a few meters away from the putative neutrinospheres. If these fast flavor conversions indeed take place, they would have important implications for the supernova explosion mechanism and nucleosynthesis.

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