Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Maximal supergravity in three dimensions: supergeometry and differential
  forms   The maximal supergravity theory in three dimensions, which has local SO(16)
and rigid $E_8$ symmetries, is discussed in a superspace setting starting from
an off-shell superconformal structure. The on-shell theory is obtained by
imposing further constraints. It is essentially a non-linear sigma model that
induces a Poincar\'e supergeometry that is described in detail. The possible
$p$-form field strengths, for $p=2,3,4$, are explicitly constructed using
supersymmetry and $E_8$. The gauged theory is also discussed.

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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: supr-con