Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-30
Physics
High Energy Physics
High Energy Physics - Phenomenology
(4 pages, 4 eps figures)
Scientific paper
The usual description of self-induced flavor conversions for neutrinos (nu's) in supernovae is based on the simplified assumption that all the nu's of the different species are emitted "half-isotropically" by a common neutrinosphere, in analogy to a blackbody emission. However, realistic supernova simulations show that nu angular distributions at decoupling are far from being half-isotropic and, above all, are flavor dependent. We show that flavor-dependent angular distributions may lead to crossing points in the angular spectra of different nu species (where F_{nu_e}=F_{nu_x} and F_{{\bar nu}_e}=F_{{\bar nu}_x}) around which a new multi-angle instability can develop. This can shift the onset of the flavor conversions toward low-radii and produce a smearing of the splitting features found with trivial nu emission models. As a result the spectral differences among nu's of different flavors could be strongly reduced.
Mirizzi Alessandro
Serpico Pasquale D.
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