Quasisteady flavor configuration of multienergy neutrino ensembles
Phys. Rev. D 114, 103009 – Published 5 November, 2026
DOI: https://doi.org/10.1103/3w9f-wyvl
Abstract
Neutrino flavor conversion profoundly impacts the explosion mechanism and multimessenger emission of core-collapse supernovae. Yet, state-of-the-art hydrodynamic simulations of neutrino-dense astrophysical environments cannot account for neutrino quantum kinetics, necessitating subgrid schemes to model the impact of neutrino self-interaction on the quasisteady flavor configuration. We present semianalytic approximations for the outcomes of both slow and fast flavor conversions in quasihomogeneous systems with periodic boundary conditions. Independent of the mass ordering, our ansatz demonstrates excellent agreement with multiangle and multienergy solutions of the neutrino kinetic equations across a wide range of representative (anti)neutrino distributions.
