Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exact gravitational lensing in conformal gravity and Schwarzschild-de
  Sitter spacetime   An exact solution is obtained for the gravitational bending of light in
static, spherically symmetric metrics which includes the Schwarzschild-de
Sitter spacetime and also the Mannheim-Kazanas metric of conformal Weyl
gravity. From the exact solution, we obtain a small bending-angle-approximation
for a lens system where the source, lens and observer are co-aligned. This
expansion improves previous calculations where we systematically avoid
parameter ranges that correspond to non-existent null trajectories. The linear
coefficient $\gamma$ characteristic to conformal gravity is shown to contribute
enhanced deflection compared to the angle predicted by General Relativity for
small $\gamma$.

35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org