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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Matter gradients slow but do not suppress neutrino-mass-induced flavor instabilities, so flavomon ray tracing is required instead of local stability analysis alone.
Steep radial lepton gradients suppress fast neutrino-flavor conversion in global spherical simulations; the suppression depends strongly on the attenuation parameter and is explained by an adiabatic condition on flavor-wave propagation, leading to a cautionary formula for classical transport codes.
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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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Flavomon ray tracing in matter gradients
Matter gradients slow but do not suppress neutrino-mass-induced flavor instabilities, so flavomon ray tracing is required instead of local stability analysis alone.
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Fast Neutrino-Flavor Conversion with Attenuation and Global Lepton Gradient
Steep radial lepton gradients suppress fast neutrino-flavor conversion in global spherical simulations; the suppression depends strongly on the attenuation parameter and is explained by an adiabatic condition on flavor-wave propagation, leading to a cautionary formula for classical transport codes.