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

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