Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Canonical Quantization of the Electromagnetic Field on the Kerr
  Background   We investigate the canonical quantization of the electromagnetic field on the
Kerr background. We give new expressions for the expectation value of the
electromagnetic stress-energy tensor in various vacua states and give a
physical interpretation of the separate terms appearing in them. We numerically
calculate the luminosity in these states. We also study the form of the
renormalized stress-energy tensor close to the horizon when the electromagnetic
field is in the past Boulware state.

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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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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: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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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: patt-sol
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The categories of this paper are: atom-ph