Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Class of Exact Solutions in String Theory   We prove that a large class of leading order string solutions which
generalize both the plane-wave and fundamental string backgrounds are, in fact,
exact solutions to all orders in \alpha'. These include, in particular, the
traveling waves along the fundamental string. The key features of these
solutions are a null symmetry and a chiral coupling of the string to the
background. Using dimensional reduction, one finds that the extremal electric
dilatonic black holes and their recently discovered generalizations with NUT
charge and rotation are also exact solutions. We show that our bosonic
solutions are also exact solutions of the heterotic string theory with no extra
gauge field background.

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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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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: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph