Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Boosting Away Singularities from Conformal String Backgrounds   Generalizing our previous work, we show how $O(d,d)$ transformations can be
used to "boost away" in new dimensions the physical singularities that occur
generically in cosmological and/or black-hole string backgrounds. As an
example, we show how a recent model by Nappi and Witten can be made
singularity-free via $O(3,3)$ boosts involving a fifth dimension.

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The categories of this paper are: cs
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The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int