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.
Johns, Thermodynamics of oscillating neutrinos, arXiv preprint arXiv:2306.14982 (2023)
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Small initial flavor perturbations in an inhomogeneous neutrino distribution exhibit chaotic divergence at small scales while domain-averaged density matrices stay stable.
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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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Chaos in Inhomogeneous Neutrino Fast Flavor Instability
Small initial flavor perturbations in an inhomogeneous neutrino distribution exhibit chaotic divergence at small scales while domain-averaged density matrices stay stable.