Multi-angle effects in collective supernova neutrino oscillations

Abstract

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.

Contribution to TAUP 07, Sendai, Japan

References in corpus (11)

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• Self-induced decoherence in dense neutrino gases
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• Collective neutrino oscillations with the halo effect in single-angle approximation
• Effect of collisions on neutrino flavor inhomogeneity in a dense neutrino gas
• Stimulated Neutrino Transformation Through Turbulence
• Supernovae, Neutrinos, and the Chirality of the Amino Acids