Evolution of collisional neutrino flavor instabilities in spherically symmetric supernova models

Zewei Xiong, Meng-Ru Wu, Gabriel Martínez-Pinedo, Tobias Fischer, Manu George, Chun-Yu Lin, and Lucas Johns
Phys. Rev. D 107, 083016 – Published 11 April 2023

Abstract

We implement a multigroup and discrete-ordinate neutrino transport model in spherical symmetry which allows to simulate collective neutrino oscillations by including realistic collisional rates in a self-consistent way. We utilize this innovative model, based on strategic parameter rescaling, to study a recently proposed collisional flavor instability caused by the asymmetry of emission and absorption rates between νe and ν¯e for four different static backgrounds taken from different stages in a core-collapse supernova simulation. Our results confirm that collisional instabilities generally exist around the neutrinosphere during the supernova accretion and postaccretion phase, as suggested by Johns [arXiv:2104.11369.]. However, the growth and transport of flavor instabilities can only be fully captured by models with global simulations as done in this work. With minimal ingredient to trigger collisional instabilities, we find that the flavor oscillations and transport mainly affect (anti)neutrinos of heavy lepton flavors around their decoupling sphere, which then leave imprints on their energy spectra in the free-streaming regime. For electron (anti)neutrinos, their properties remain nearly intact. We also explore various effects due to the decoherence from neutrino-nucleon scattering, artificially enhanced decoherence from emission and absorption, neutrino vacuum mixing, and inhomogeneous matter profile, and discuss the implication of our work.

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  • Received 15 October 2022
  • Accepted 9 March 2023

DOI:https://doi.org/10.1103/PhysRevD.107.083016

© 2023 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Zewei Xiong1,*, Meng-Ru Wu2,3,8, Gabriel Martínez-Pinedo1,4, Tobias Fischer5, Manu George2, Chun-Yu Lin6, and Lucas Johns7

  • 1GSI Helmholtzzentrum für Schwerioneneforschung, Planckstraße 1, 64291 Darmstadt, Germany
  • 2Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
  • 3Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 10617, Taiwan
  • 4Institut für Kernphysik (Theoriezentrum), Fachbereich Physik, Technische Universität Darmstadt, Schlossgartenstraße 2, 64289 Darmstadt, Germany
  • 5Institute of Theoretical Physics, University of Wroclaw, Pl. M. Borna 9, 50-204 Wroclaw, Poland
  • 6National Center for High-performance Computing, National Applied Research Laboratories, Hsinchu Science Park, Hsinchu City 30076, Taiwan
  • 7Departments of Astronomy and Physics, University of California, Berkeley, California 94720, USA
  • 8Physics Division, National Center for Theoretical Sciences, Taipei 10617, Taiwan

  • *z.xiong@gsi.de

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Vol. 107, Iss. 8 — 15 April 2023

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