Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coset Models Obtained by Twisting WZW Models and Stringy Charged Black
  Holes in Four Dimensions   We show that several WZW coset models can be obtained by applying O(d,d)
symmetry transformations (referred to as twisting) on WZW models. This leads to
a conjecture that WZW models gauged by U(1)^n subgroup can be obtained by
twisting (ungauged) WZW models. In addition, a class of solutions that describe
charged black holes in four dimensions is derived by twisting SL(2,R)\times
SU(2) WZW.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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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: econ
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio