Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série APC-TH
Domaines hep-th
Date Mardi 20 Juin 2017
Heure 14:00
Institut APC
Salle 483 A - Malevitch
Nom de l'orateur Sen
Prenom de l'orateur Manibrata
Addresse email de l'orateur
Institution de l'orateur Tata Institute of Fundamental Research, Mumbai
Titre Revisiting supernova neutrino phenomenology with non-standard neutrino self-interactions
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.
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