Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Note on Geodesics in Hayward Metric   We study timelike and null geodesics in a non-singular black hole metric
proposed by Hayward. The metric contains an additional length-scale parameter
$\ell$ and approaches the Schwarzschild metric at large radii while approaches
a constant at small radii so that the singularity is resolved. We tabulate the
various critical values of $\ell$ for timelike and null geodesics: the critical
values for the existence of horizon, marginally stable circular orbit and
photon sphere. We find the photon sphere exists even if the horizon is absent
and two marginally stable circular orbits appear if the photon sphere is absent
and a stable circular orbit for photons exists for a certain range of $\ell$.
We visualize the image of a black hole and find that blight rings appear even
if the photon sphere is absent.

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The categories of this paper are: hep-ph
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The categories of this paper are: stat
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
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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: astro-ph
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The categories of this paper are: bayes-an