Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decay of massive scalar field in a black hole background immersed in
  magnetic field   We evaluate quasinormal modes of massive scalar field of the Ernst spacetime,
an exact solution of the Einstein-Maxwell equations describing a black hole
immersed in uniform magnetic field $B$. It is known that the quasinormal
spectrum for massive scalar field in the vicinity of the magnetized black holes
acquires an effective mass $\mu_{eff}= \sqrt{4B^2 m^2+\mu^2}$, where $m$ is the
azimuthal number and $\mu$ is the mass of scalar field. The numerical result
shows that increasing of the field effective mass and the magnetic field $B$
gives rise to decreasing of the imaginary part of the quasinormal modes until
reaching the vanishing damping rate.

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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph