Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $N=2$ heterotic string threshold correction, $K3$ surface and
  generalized Kac-Moody superalgebra   We study a standard-embedding $N=2$ heterotic string compactification on
$K3\times T^2$ with a Wilson line turned on and perform a world-sheet
calculation of string threshold correction. The result can be expressed in
terms of the quantities appearing in the two-loop calculation of bosonic
string. We also comment and speculate on the relevance of our result to
generalized Kac-Moody superalgebra and $N=2$ heterotic-type IIA duality.

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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th