Neutrino quantum kinetics in a core-collapse supernova

Shalgar, Shashank; Tamborra, Irene

doi:10.1088/1475-7516/2024/09/021

Neutrino quantum kinetics in a core-collapse supernova

Shashank Shalgar
(
- DARK Cosmology Ctr. and
- Bohr Inst.
)
,
Irene Tamborra
(
- DARK Cosmology Ctr. and
- Bohr Inst.
)

Jun 13, 2024

25 pages

Published in:

JCAP 09 (2024) 021

Published: Sep 9, 2024

e-Print:

2406.09504 [astro-ph.HE]

DOI:

10.1088/1475-7516/2024/09/021

View in:

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Abstract: (IOP)

Our understanding of neutrino flavor conversion in the supernova core is stillpreliminary, despite its likely relevance to the neutrino-driven supernova mechanism. We presentmulti-angle and multi-energy numerical simulations of neutrino quantum kinetics within aspherically symmetric shell in the proximity of the region of neutrino decoupling. We rely oninputs from a one-dimensional core-collapse supernova model with a mass of 18.6 M

_{⊙}

andfind that, at early post-bounce times (t

_{pb}

≲ 0.5 s), no crossing is present inthe angular distribution of the electron neutrino lepton number and flavor conversion is triggeredby slow collective instabilities. Angular crossings appear for t

_{pb}

≳ 0.5 sand fast flavor conversion leads to flavor equipartition, with the spectral energy distribution of ν

_{e}

(ν̅

_{e}

) and ν

_{x}

(ν̅

_{x}

) becoming comparable. Notably, flavorequipartition is not a generic outcome of fast flavor conversion, rather it is a consequence ofthe relatively similar properties of neutrinos of different flavors characterizing the lateaccretion phase. Artificially tweaking the collision term to introduce an electron lepton numberangular crossing for t

_{pb}

≲ 0.5 s, we observe that flavor equipartition isnot achieved. While our findings are restricted to a specific supernova model, and they only takeinto account the feedback of the neutrino background on the flavor conversion, they suggest a richphenomenology in the supernova core as a function of the post-bounce time which needs to befurther explored to assess its impact on the explosion mechanism.

Note:

25 pages, 13 figures. Version accepted in JCAP

supernova neutrinos
neutrino properties
neutrino theory

References(83)

Figures(16)

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