Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pair creation rate for $U(1)^2$ black holes   I consider a truncation of low-energy string theory which contains two $U(1)$
gauge fields. After making some general comments on the theory, I describe a
previously-obtained instanton for the pair creation of black holes when both
gauge fields are non-zero, and obtain the pair creation rate by calculating its
action. This calculation agrees qualitatively with the earlier calculation of
the pair creation rate for black holes in Einstein-Maxwell theory. That is, the
pair creation is strongly suppressed in realizable circumstances, and it
reduces to the Schwinger result in the point-particle limit. The pair creation
of non-extreme black holes is enhanced over that of extreme black holes by
$e^{{\cal A}_{bh}/4}$.

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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg