Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Codimension two marginally trapped submanifolds in Robertson-Walker
  spaces   We give a local characterization of codimension two submanifolds which are
marginally trapped in Robertson-Walker spaces, in terms of an algebraic
equation to be satisfied by the height function. We prove the existence of a
large number of local solutions. We refine the description in the case of
curves with null acceleration in three-dimensional spaces Robertson-Walker
spaces, and in the case of codimension two submanifolds whose second
fundamental form is null

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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
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The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn