1305.7140 (Georg Raffelt et al.)

Azimuth-angle flavor instability of supernova neutrino fluxes    [PDF]

Georg Raffelt, Srdjan Sarikas, David de Sousa Seixas

Dense neutrino fluxes experience self-induced flavor conversion caused by neutrino-neutrino refraction. For the first time, we include the azimuth angle of neutrino propagation as an explicit variable and obtain solutions without enforcing axial symmetry. We find a new generic multi-azimuth-angle (MAA) instability in addition to the one caused by multi zenith angles (MZA). For simple spectra, the MAA instability occurs in the normal neutrino mass hierarchy, but it affects the solution in both hierarchies, likely causing kinematical decoherence among angle modes. Suppression of the MAA instability in supernovae requires larger matter densities than for the bimodal case.

View original: http://arxiv.org/abs/1305.7140