Collective flavour transitions of supernova neutrinos

TL;DR

This paper explores how high neutrino densities in supernovae lead to collective flavour transitions, affecting observable spectra and potentially revealing neutrino properties like mass hierarchy and mixing angles.

Contribution

It analyzes collective neutrino flavour transitions in supernovae within two- and three-neutrino frameworks, linking these effects to observable spectra and neutrino parameters.

Findings

Collective flavour transitions significantly alter supernova neutrino spectra.

Detection of these effects can determine neutrino mass hierarchy.

The study provides predictions for future galactic supernova observations.

Abstract

When the neutrino density is very high, as in core-collapse supernovae, neutrino-neutrino interactions are not negligible and can appreciably affect the evolution of flavour. The physics of these phenomena is briefly highlighted, and their effects are shown on observable energy spectra from a future galactic supernova within two-neutrino and three-neutrino frameworks. Detection of such effects could provide a handle on two unknowns: the neutrino mass hierarchy, and the mixing angle theta(13).