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The dense neutrino flux streaming from a core-collapse supernova can undergoself-induced flavor conversion caused by neutrino-neutrino refraction.Numerical studies of these nonlinear effects are challenging becauserepresenting the neutrino radiation field by discrete energy and angle bins caneasily lead to unphysical solutions. In particular, if the number of angle binsN_a is too small, flavor conversion begins too deep and produces completelyspurious results. At the same time, N_a=1 (single-angle approximation) can be agood proxy for the N_a -> infinity limit. Based on a linearized stabilityanalysis, we explain some of the puzzling effects of discrete angledistributions.

Spurious instabilities in multiangle simulations of collective flavor conversion