Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Schwarzschild-like black holes: Light-like trajectories and massless
  scalar absorption   Black holes are among the most intriguing objects in nature. They are
believed to be fully described by General Relativity (GR), and the
astrophysical black holes are expected to belong to the Kerr family, obeying
the no-hair theorems. Alternative theories of gravity or parameterized
deviations of GR allow black hole solutions, which have additional parameters
other than mass and angular momentum. We analyze a Schwarzschild-like metric,
proposed by Johannsen and Psaltis, characterized by its mass and a deformation
parameter. We compute the absorption cross section of massless scalar waves for
different values of this deformation parameter and compare it with the
corresponding scalar absorption cross section of the Schwarzschild black hole.
We also present analytical approximations for the absorption cross section in
the high-frequency regime. We check the consistence of our results comparing
the numerical and analytical approaches, finding excellent agreement.

37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom