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Résumé |
Neutrino self-interactions are known to lead to non-linear collective flavor
oscillations in a core-collapse supernova. In this talk, I will point out new possible effects of non-standard
self-interactions (NSSI) of neutrinos on flavor conversions in a two-flavor framework. I will
show that, for a single-energy neutrino-antineutrino ensemble, a flavor instability is gener-
ated even in normal hierarchy for large enough NSSI. Using a toy model for the neutrino
spectra, I will demonstrate that flavor-preserving NSSI lead to pinching of spectral swaps, while flavor-
violating NSSI cause swaps to develop away from a spectral crossing or even in the absence of
a spectral crossing. Consequently, NSSI could give rise to collective oscillations and spectral
splits even during neutronization burst, for both hierarchies. |
