Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on Dirac Neutrinos from SN 1987A   The Livermore Supernova Explosion Code was used to calculate the effect of a
massive Dirac neutrino on neutrino emission from SN 1987A in a fully
self-consistent manner. Spin-flip interactions lead to the copious emission of
sterile, right-handed neutrinos and cool the core faster than the observed
neutrino emission time for Dirac masses exceeding about 3$\,$keV. This limit is
relaxed to $7\,$keV if pion emission processes in the core are neglected. These
limits are compared with the previous less stringent limits of Burrows et al.

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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph