Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Essential self-adjointness of the wave operator and the limiting
  absorption principle on Lorentzian scattering spaces   We discuss the essential self-adjointness of wave operators, as well as the
limiting absorption principle, in generalizations of asymptotically Minkowski
settings. This is obtained via using a Fredholm framework for inverting the
spectral family first, and then refining its conclusions to show its dense
range in L^2 when acting on an appropriate subdomain.

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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph