Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Compactifications on twisted tori with fluxes and free differential
  algebras   We describe free differential algebras for non-abelian one and two form gauge
potentials in four dimensions deriving the integrability conditions for the
corresponding curvatures. We show that a realization of these algebras occurs
in M-theory compactifications on twisted tori with constant four-form flux, due
to the presence of antisymmetric tensor fields in the reduced theory.

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The categories of this paper are: plasm-ph
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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: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: cs