Fast neutrino flavor conversion modes in multidimensional core-collapse supernova models: The role of the asymmetric neutrino distributions

Sajad Abbar, Huaiyu Duan, Kohsuke Sumiyoshi, Tomoya Takiwaki, and Maria Cristina Volpe
Phys. Rev. D 101, 043016 – Published 20 February 2020

Abstract

A dense neutrino gas, such as the one anticipated in the supernova environment, can experience fast neutrino flavor conversions on scales much shorter than those expected in vacuum probably provided that the angular distributions of νe and ν¯e cross each other. We perform a detailed investigation of the neutrino angular distributions obtained by solving the Boltzmann equations for fixed matter profiles of some representative snapshots during the postbounce phase of core-collapse supernovae in multidimensional calculations of a 11.2M and a 27M progenitor model. Although the 11.2M model features νeν¯e angular crossings and the associated fast modes at different time snapshots, the 27M model does not show any crossings within the decoupling region. We show that this can be understood by studying the multipole components of the neutrino distributions. In fact, there is a higher chance for the occurrence of νeν¯e angular crossings for the zones where the multipole components of the neutrino distributions are strong enough. We also show that there can exist more than one crossing between the angular distributions of νe and ν¯e. In addition, apart from the crossings within the neutrino decoupling region, there is a class of νeν¯e angular crossings that appears very deep inside the protoneutron star.

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  • Received 7 November 2019
  • Accepted 5 February 2020

DOI:https://doi.org/10.1103/PhysRevD.101.043016

© 2020 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Sajad Abbar1,2, Huaiyu Duan2, Kohsuke Sumiyoshi3, Tomoya Takiwaki4, and Maria Cristina Volpe1

  • 1Astro-Particule et Cosmologie (APC), CNRS UMR 7164, Université Denis Diderot, 75205 Paris Cedex 13, France
  • 2Department of Physics & Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA
  • 3National Institute of Technology, Numazu College, Ooka 3600, Numazu, Shizuoka 410-8501, Japan
  • 4National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan

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Issue

Vol. 101, Iss. 4 — 15 February 2020

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