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- W4376136385 abstract "Neutrino-neutrino forward scatterings potentially induce collective neutrino oscillation in dense neutrino gases in astrophysical sites such as core-collapse supernovae (CCSN) and binary neutron star mergers (BNSM). In this paper, we present a detailed study of fast neutrino-flavor conversion (FFC), paying special attention to asymptotic states, by linear stability analysis and local simulations with a periodic boundary condition. We find that asymptotic states can be characterized by two key properties of FFC: (1) the conservation of lepton number for each flavor of neutrinos and (2) the disappearance of ELN(electron neutrino-lepton number)-XLN(heavy-leptonic one) angular crossings in the spatial- or time-averaged distributions. The system which initially has the positive (negative) ELN-XLN density reaches a flavor equipartition in the negative (positive) ELN-XLN angular directions, and the other part compensates it to preserve the conservation laws. These properties of FFCs offer an approximate scheme determining the survival probability of neutrinos in asymptotic states without solving quantum kinetic equations. We also demonstrate that the total amount of flavor conversion can vary with species-dependent neutrino distributions for identical ELN-XLN ones. Our results suggest that even shallow or narrow ELN angular crossings have the ability to drive large flavor conversion, exhibiting the need for including the effects of FFCs in the modeling of CCSN and BNSM." @default.
- W4376136385 created "2023-05-12" @default.
- W4376136385 creator A5048333607 @default.
- W4376136385 creator A5083131983 @default.
- W4376136385 date "2023-05-11" @default.
- W4376136385 modified "2023-09-30" @default.
- W4376136385 title "Simple method for determining asymptotic states of fast neutrino-flavor conversion" @default.
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- W4376136385 doi "https://doi.org/10.1103/physrevd.107.103022" @default.
- W4376136385 hasPublicationYear "2023" @default.
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