Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Covariant canonical formalism for Dirac-Nambu-Goto bosonic p-branes and
  the Gauss-Bonnet topological term in string theory   Using a covariant and gauge invariant geometric structure constructed on the
Witten covariant phase space for Dirac-Nambu-Goto bosonic p-branes propagating
in a curved background, we find the canonically conjugate variables, and the
relevant commutation relations are considered, as well as, we find the
canonical variables for the Gauss-Bonnet topological term in string theory.

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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: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
1
The categories of this paper are: cs
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The categories of this paper are: astro-ph