Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spurious instabilities in multiangle simulations of collective flavor
  conversion   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.

18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex