Investigations of Fast-Pairwise Collective Neutrino Oscillations in Core-Collapse Supernovae based on the Results of Boltzmann Simulations

Abstract

Neutrinos are believed to play a crucial role in the explosion mechanism of core-collapse supernovae (CCSNe). They may change their flavor identities through so-called fast-pairwise conversions induced by mutual forward scatterings. It is known that when the angular distributions of ν e andν e cross each other, fast-pairwise collective neutrino oscillations occur. In this proceedings, we present the latest results of our analysis based on a survey thorough all radii and azimuthal angles on the results of fully self-consistent, realistic simulations of core-collapse supernova in two spatial dimensions. As a result, crossings between ν e andν e angular distributions are found at r ≈ 16-18 km, which is in the vicinity of the neutrino sphere. This new finding may have some influence on the explosion mechanism of CCSNe and neutrino astronomy.