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A Systematic Study on the Resonance in Collisional Neutrino Flavor Instability

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arxiv 2302.06263 v2 pith:FQMMMSXB submitted 2023-02-13 hep-ph astro-ph.HE

classification hep-phastro-ph.HE
keywords resonanceflavorcollisionalinstabilitymodesnonlinearreportedwell
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Investigations on the resonance in the collisional flavor instability (CFI) of neutrinos, which were reported recently, are reported. We show that the resonance occurs not only for the isotropy-preserving modes as pointed out in the previous work but also for the isotropy-breaking modes and that it enhances the growth rate of CFI by orders of magnitude. Employing the linear analysis and nonlinear numerical simulations in the two-flavor scheme and under the relaxation approximation for the collision term, we discuss the criterion for the resonance, its effect on the nonlinear evolution as well as the influences of homogeneity-breaking (k \ne 0) perturbations as well as of anisotropy in the background on the resonance. We will also touch the cohabitation of the resonance with the fast flavor conversion (FFC).

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Predicting the outcome of collisional neutrino flavor conversion

    hep-ph 2025-05 conditional novelty 7.0 of 10

    Collisional neutrino flavor instabilities settle into a state at the edge of instability with nonzero flavor coherence, and explicit formulas predict this final state.

  2. Comparative Testing of Subgrid Models for Fast Neutrino Flavor Conversions in Core-collapse Supernova Simulations

    astro-ph.HE 2025-06 conditional novelty 6.0 of 10

    A 1D supernova simulation with four-species BGK subgrid modeling shows that three-species assumptions overestimate flavor conversion and that semi-implicit time integration is the most reliable.

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