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

Johns, Lucas; Nagakura, Hiroki; Fuller, George M.; Burrows, Adam

doi:10.1103/PhysRevD.102.103017

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

Sep 18, 2020

16 pages

Published in:

Phys.Rev.D 102 (2020) 10, 103017

Published: Nov 16, 2020

e-Print:

2009.09024 [hep-ph]

DOI:

10.1103/PhysRevD.102.103017

View in:

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Abstract: (arXiv)

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.

Note:

15 pages, 8 figures

Astrophysics and astroparticle physics
neutrino: supernova
neutrino: flavor
oscillation
cascade
stability
plasma

References(72)

Figures(29)

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