Neutrino quantum kinetics in a core-collapse supernova
Shashank Shalgar, Irene Tamborra

TL;DR
This paper presents detailed simulations of neutrino flavor conversion in a supernova core, revealing how flavor dynamics evolve over time and impact supernova physics.
Contribution
It introduces multi-angle, multi-energy quantum kinetic simulations of neutrinos near the decoupling region, highlighting the time-dependent emergence of flavor conversions.
Findings
No flavor crossing at early times ($t_{pb} \,\lesssim\, 0.5$ s)
Fast flavor conversion leads to flavor equipartition at later times
Flavor equipartition depends on neutrino properties during late accretion phase
Abstract
Our understanding of neutrino flavor conversion in the supernova core is still preliminary, despite its likely relevance to the neutrino-driven supernova mechanism. We present multi-angle and multi-energy numerical simulations of neutrino quantum kinetics within a spherically symmetric shell in the proximity of the region of neutrino decoupling. We rely on inputs from a one-dimensional core-collapse supernova model with a mass of and find that, at early post-bounce times (~s), no crossing is present in the angular distribution of the electron neutrino lepton number and flavor conversion is triggered by slow collective instabilities. Angular crossings appear for ~s and fast flavor conversion leads to flavor equipartition, with the spectral energy distribution of () and …
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Taxonomy
TopicsNeutrino Physics Research · Particle physics theoretical and experimental studies · Dark Matter and Cosmic Phenomena
