Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global existence of solutions for semilinear wave equations in
  Friedmann-Lema\^itre-Robertson-Walker spacetime   We consider the nonlinear massless wave equation belonging to some family of
the Friedmann-Lema\^itre-Robertson-Walker (FLRW) spacetime. We prove the global
in time small data solutions for supercritical powers in the case of
decelerating expansion universe.

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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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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: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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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: math-ph