Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational lensing by a black hole in Poincar{\'e} gauge theory of
  gravity   Using a recently found black hole solution in the framework of the
Poincar{\'e} gauge theory of gravity, we study gravitational lensing for a
system where the lens is a static spherically symmetric black hole. By
analyzing the equations of motion for light rays in a space-time with torsion,
we derive the deflection angle as the light emitted from a source pass through
near the black hole and numerically solve the resulting integral. We also study
the effects of torsion on the position of images. The results show that the
presence of torsion slightly alters both the deflection angle and position of
images in this setup.

33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg