Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-13
J.Phys.Conf.Ser.120:052021,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
Contribution to TAUP 07, Sendai, Japan
Scientific paper
10.1088/1742-6596/120/5/052021
We study two-flavor collective neutrino oscillations in the dense-neutrino region above the neutrino sphere in a supernova (SN). The angular dependence of the neutrino-neutrino interaction potential causes "multi-angle" effects that can lead either to complete kinematical decoherence in flavor space or only to small differences between different trajectories. This nonlinear system switches abruptly between "self-maintained coherence" and "self-induced decoherence" among the angular modes, depending on the strength of the deleptonization flux. For a realistic SN the quasi single-angle behavior is probably typical, simplifying the numerical treatment and probably allowing for the survival of observational features of flavor oscillations.
Esteban-Pretel Andreu
Pastor Sergio
Raffelt Georg
Sigl Günter
Tomas Ricard
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