Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hadamard property of the in and out states for Klein-Gordon fields on
  asymptotically static spacetimes   We consider the massive Klein-Gordon equation on a class of asymptotically
static spacetimes (in the long range sense) with Cauchy surface of bounded
geometry. We prove the existence and Hadamard property of the in and out states
constructed by scattering theory methods.

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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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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: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph