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Fast Flavor Depolarization of Supernova Neutrinos
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Fast Flavor Depolarization of Supernova Neutrinos
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Flavor-dependent neutrino emission is critical to the evolution of a supernova and its neutrino signal. In the dense anisotropic interior of the star, neutrino-neutrino forward-scattering can lead to fast collective neutrino oscillations, which has striking consequences. We present a theory of fast flavor depolarization, explaining how neutrino flavor differences become smaller, i.e., depolarize, due to diffusion to smaller angular scales. We show that transverse relaxation determines the epoch of this irreversible depolarization. We give a method to compute the depolarized fluxes, presenting an explicit formula for simple initial conditions, which can be a crucial input for supernova theory and neutrino phenomenology.
Forward citations
Cited by 2 Pith papers
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Collective neutrino-antineutrino pair oscillations
In anisotropic neutrino gases, νν-bar pairing instabilities emerge when the excessive pair-occupation number distribution changes sign, producing pair conversions at growth rates comparable to fast flavor instabilities.
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Intermittent Turbulence, Fast Flavor Conversion, and Observable Supernova Probes
Using a She-Leveque cascade for intermittent turbulence in supernovae, the model predicts a fast flavor conversion fraction of approximately 0.455 and heating corrections of 4-6% whose sign depends on the neutrino spe...
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