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Asymptotic states of fast neutrino-flavor conversions in the three-flavor framework

Jiabao Liu1, Hiroki Nagakura2, Masamichi Zaizen3, Lucas Johns4, and Shoichi Yamada5,6

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Phys. Rev. D 111, 123004 – Published 3 June, 2025

DOI: https://doi.org/10.1103/v9lr-ydbb

Abstract

There has been growing evidence that mu and tau neutrinos are noticeably different due to the emergence of muons in core-collapse supernovae (CCSNe) and binary neutron star mergers (BNSMs). Recent theoretical studies also suggest that all flavors of neutrinos and antineutrinos inevitably experience some flavor mixing instabilities including fast neutrino flavor conversions (FFC), which corresponds to one of the collective neutrino oscillations powered by neutrino self-interactions. This represents a need for quantum kinetic treatment in the numerical modeling of neutrino dynamics, which is, however, a formidable computational challenge. In this paper, we present an approximate method to predict asymptotic states of FFC without solving a quantum kinetic equation under a three-flavor framework, in which mu and tau neutrino distributions are not necessarily identical to each other. The approximate method is developed based on a Bhatnagar-Gross-Krook (BGK) relaxation time prescription, capable of capturing essential features of mixing competitions among three different flavor-coherent states. Our proposed scheme is computationally inexpensive and easy to implement in any classical neutrino transport scheme.

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Phys. Rev. D 111, 123004– Published 3 June, 2025
  • Received 25 March 2025
  • Accepted 20 May 2025
Article part of CHORUS
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