Thursday, October 18, 2012

1210.4557 (Srdjan Sarikas et al.)

Spurious instabilities in multi-angle simulations of collective flavor
conversion
   [PDF]

Srdjan Sarikas, David de Sousa Seixas, Georg Raffelt
The dense neutrino flux streaming from a core-collapse supernova can undergo self-induced flavor conversion caused by neutrino-neutrino refraction. Numerical studies of these nonlinear effects are challenging because representing the neutrino radiation field by discrete energy and angle bins can easily lead to unphysical solutions. In particular, if the number of angle bins N_a is too small, flavor conversion begins too deep and produces completely spurious results. At the same time, N_a=1 (single-angle approximation) can be a good proxy for the N_a -> infinity limit. Based on a linearized stability analysis, we explain some of the puzzling effects of discrete angle distributions.
View original: http://arxiv.org/abs/1210.4557

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