Neutrino quantum kinetics is computationally intractable in the neutrino-dense arenas of core-collapse supernovae and neutron star mergers. Flavor-wave (or flavomon) transport is an emerging approach to this problem in which small-scale flavor inhomogeneities are treated as quasiparticles with properties determined by the local mean background. We present the first numerical calculations of flavor-wave transport under slow driving. Our results show some quantitative successes but also underscore the theoretical challenges that need to be overcome. Two issues are particularly concerning. (1) Nonlinear wave-wave coupling may be important. (2) Degeneracies and small energy gaps are responsible for significant nonadiabatic transitions. Future work will need to address these points if flavor-wave transport is to be viable in settings of astrophysical interest. Other topics examined include flavor-wave parallel transport and flavor-space symmetry breaking.
Fast flavor conversions (FFCs) of neutrinos, driven by the fast flavor instability (FFI), can reshape the neutrino flavor content in dense astrophysical environments such as core-collapse supernovae and neutron star mergers. Most studies of FFCs adopt a two-step approach, in which a flavor-unstable state containing dee...
We study collective slow flavor conversion (SFC) of supernova neutrinos with multi-energy, multi-angle simulations for three representative neutrino spectra in the early accretion, late accretion, and cooling phases, in which multiple crossings between the initial electron- and heavy-lepton-flavor spectra are present....
Heng-Hao Chen, I. Padilla-Gay, Meng-Ru Wu et al.· 1 citation
Compact transient sources, such as supernovae (SNe) and neutron star mergers (NSMs), host a population of thermal neutrinos in their inner cores, which decouple from the dense matter as they stream out. Yet, collisionless does not mean free; their density is large enough to mediate collective waves driven by the cohere...
Fast neutrino flavor conversion is a crucial yet poorly understood process in core-collapse supernovae due to its dependence on neutrino angular distributions and the microscopic scales. In this study, I present the general relativistic multiangle Boltzmann neutrino radiation hydrodynamics simulations incorporating a q...
Ryuichiro Akaho· Classical and quantum gravit...· 0 citations
In this review, we survey neutrino quantum kinetics in core-collapse supernovae (CCSNe), with emphasis on collective flavor conversion and its possible role in the explosion dynamics. We summarize the physical ingredients of modern CCSN simulations, with particular emphasis on neutrino transport and the detailed neutri...
Jia-Bao Liu, Akira Harada, H. Nagakura· Classical and quantum gravit...· 0 citations
Neutrino flavor conversion profoundly impacts the explosion mechanism and multi-messenger emissions 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...
Manuel Goimil-García, I. Tamborra· 2 citations
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