Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiation from charged particles on eccentric orbits in a dipolar
  magnetic field around a Schwarzschild black hole   We obtain an approximate solution for the motion of a charged particle around
a Schwarzschild black hole immersed in a weak dipolar magnetic field. We focus
on eccentric bound orbits in the equatorial plane of the Schwarzschild black
hole and derive an analytic expression for the spectral distribution of the
electromagnetic emission from a charged particle on such an orbit. Two sets of
harmonic contributions appear, with specific frequency spacing. The expression
can be written in compact form, if it is truncated up to the lowest order
harmonic contributions.

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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
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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: cmp-lg
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The categories of this paper are: econ