Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Selected spherical photon orbits around a deformed Kerr black hole   In this paper, we investigate so-called spherical photon orbits around a
deformed Kerr black hole with an extra deformation parameter. The change in the
azimuth $\Delta\varphi$ and the angle of dragging of nodes per revolution
$\Delta\Omega $ of a complete latitudinal oscillated orbit is calculated
analytically. Finally, representative six examples orbits are plotted out to
illustrate how spherical photon orbits look like and exhibit some interesting
behavior. Especially, this spherical photon orbits are absent in circular
orbits and different from the Kerr case.

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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
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The categories of this paper are: math
16
The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat