Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase Transitions In M-Theory And F-Theory   Phase transitions are studied in $M$-theory and $F$-theory. In $M$-theory
compactification to five dimensions on a Calabi-Yau, there are
topology-changing transitions similar to those seen in conformal field theory,
but the non-geometrical phases known in conformal field theory are absent. At
boundaries of moduli space where such phases might have been expected, the
moduli space ends, by a conventional or unconventional physical mechanism. The
unconventional mechanisms, which roughly involve the appearance of tensionless
strings, can sometimes be better understood in $F$-theory.

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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: q-alg