Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Perturbative Properties of Heterotic String Vacua Compactified on
  ${K3\times T^2}$   Using the heterotic--type II duality of $N=2$ string vacua in four space-time
dimensions we study non-perturbative couplings of toroidally compactified
six-dimensional heterotic vacua. In particular, the heterotic--heterotic
$S$-duality and the Coulomb branch of tensor multiplets observed in six
dimensions are studied from a four-dimensional point of view. We explicitly
compute the couplings of the vector multiplets of several type II vacua and
investigate the implications for their heterotic duals.

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The categories of this paper are: hep-ph
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The categories of this paper are: math
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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: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg