Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple model for spectral swapping of supernova neutrinos   Neutrinos emitted from a core-collapse supernova can experience collective
flavor transformation because of high neutrino fluxes. As a result, neutrinos
of different flavors can have their energy spectra (partially) swapped, a
phenomenon known as the (stepwise) spectral swapping or spectral split. We give
a brief review of a simple model that explains this phenomenon.

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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin