Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasi-bound state resonances of charged massive scalar fields in the
  near-extremal Reissner-Nordstr\"om black-hole spacetime   The quasi-bound states of charged massive scalar fields in the near-extremal
charged Reissner-Nordstr\"om black-hole spacetime are studied {\it
analytically}. These discrete resonant modes of the composed black-hole-field
system are characterized by the physically motivated boundary condition of
ingoing waves at the black-hole horizon and exponentially decaying (bounded)
radial eigenfunctions at spatial infinity. Solving the Klein-Gordon wave
equation for the linearized scalar fields in the black-hole spacetime, we
derive a remarkably compact analytical formula for the complex frequency
spectrum which characterizes the quasi-bound state resonances of the composed
Reissner-Nordstr\"om-black-hole-charged-massive-scalar-field system.

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The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn