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Title: Fast oscillations, collisionless relaxation, and spurious evolution of supernova neutrino flavor

Abstract

Mounting evidence indicates that neutrinos likely undergo fast flavor conversion (FFC) in at least some core-collapse supernovae. Outcomes of FFC, however, remain highly uncertain. Here we study the cascade of flavor-field power from large angular scales in momentum space down to small ones, showing that FFC enhances this process and thereby hastens relaxation. Cascade also poses a computational challenge, which is present even if the flavor field is stable: When power reaches the smallest angular scale of the calculation, error from truncating the angular-moment expansion propagates back to larger scales, to disastrous effect on the overall evolution. Essentially the same issue has prompted extensive work in the context of plasma kinetics. This link suggests new approaches to averting spurious evolution, a problem that presently puts severe limitations on the feasibility of realistic oscillation calculations.

Authors:
ORCiD logo; ; ;
Publication Date:
Research Org.:
Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); Heising-Simons Foundation; Sponsoring Consortium for Open Access Publishing in Particle Physics (SCOAP3)
OSTI Identifier:
1714405
Alternate Identifier(s):
OSTI ID: 1852578
Grant/Contract Number:  
de-sc0018297; 00009650; SC0018297; HST-HF2-51461.001-A; NAS5-26555; PHY-1914242; PHY-1804048 PHY-1630782; 2017-22; AST-1714267
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 102 Journal Issue: 10; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; astronomy & astrophysics; physics; neutrino oscillations; particle phenomena; particle mixing and oscillations; novae and supernovae; transient and explosive astronomical phenomena

Citation Formats

Johns, Lucas, Nagakura, Hiroki, Fuller, George M., and Burrows, Adam. Fast oscillations, collisionless relaxation, and spurious evolution of supernova neutrino flavor. United States: N. p., 2020. Web. doi:10.1103/PhysRevD.102.103017.
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Johns, Lucas, Nagakura, Hiroki, Fuller, George M., & Burrows, Adam. Fast oscillations, collisionless relaxation, and spurious evolution of supernova neutrino flavor. United States. https://doi.org/10.1103/PhysRevD.102.103017
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Johns, Lucas, Nagakura, Hiroki, Fuller, George M., and Burrows, Adam. Mon . "Fast oscillations, collisionless relaxation, and spurious evolution of supernova neutrino flavor". United States. https://doi.org/10.1103/PhysRevD.102.103017.
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@article{osti_1714405,
title = {Fast oscillations, collisionless relaxation, and spurious evolution of supernova neutrino flavor},
author = {Johns, Lucas and Nagakura, Hiroki and Fuller, George M. and Burrows, Adam},
abstractNote = {Mounting evidence indicates that neutrinos likely undergo fast flavor conversion (FFC) in at least some core-collapse supernovae. Outcomes of FFC, however, remain highly uncertain. Here we study the cascade of flavor-field power from large angular scales in momentum space down to small ones, showing that FFC enhances this process and thereby hastens relaxation. Cascade also poses a computational challenge, which is present even if the flavor field is stable: When power reaches the smallest angular scale of the calculation, error from truncating the angular-moment expansion propagates back to larger scales, to disastrous effect on the overall evolution. Essentially the same issue has prompted extensive work in the context of plasma kinetics. This link suggests new approaches to averting spurious evolution, a problem that presently puts severe limitations on the feasibility of realistic oscillation calculations.},
doi = {10.1103/PhysRevD.102.103017},
journal = {Physical Review D},
number = 10,
volume = 102,
place = {United States},
year = {2020},
month = {11}
}
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https://doi.org/10.1103/PhysRevD.102.103017
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