Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analytical and Numerical Methods and Test Calculations of
  One-Dimensional Force--Free Magnetodynamics on Arbitrary Magnetic Surfaces
  across Horizons of Spinning Black Holes   Numerical simulations of the force-free magnetodynamics (FFMD) of the
electromagnetic field around a spinning black hole are useful to investigate
the dynamic electromagnetic processes around a spinning black hole, such as the
emergence of the Blandford--Znajek mechanism. To reveal the basic physics of
magnetic fields around a black hole through the dynamic process, we use
one-dimensional (1D) FFMD along the axisymmetric magnetic surface, which
provides a relatively simple, sufficiently precise, and powerful tool to
analyze the dynamic process around a spinning black hole. We review the
analytic and numerical aspects of 1D FFMD for an arbitrary magnetic surface
around a black hole. In addition, we also show some numerical simulation test
results for three types of magnetic surfaces at the equatorial plane of the
black hole.

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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: supr-con
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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: solv-int
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The categories of this paper are: econ
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin