Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QED Effects on Kerr Black Hole Shadows immersed in uniform magnetic
  fields   In this work, taking the QED effect into account, we investigate the shadows
of the Kerr black holes immersed in uniform magnetic fields through the
numerical backward ray-tracing method. We introduce a dimensionless parameter
$\Lambda$ to characterize the strength of magnetic fields and studied the
influence of magnetic fields on the Kerr black hole shadows for various spins
of the black holes and inclination angles of the observers. In particular, we
find that the photon "hairs" appear near the left edge of the shadow in the
presence of magnetic fields. The photon hairs may be served as a signature of
the magnetic fields. We notice that the photon hairs become more evident when
the strength of magnetic fields or the spin of the black hole becomes larger.
In addition, we study the deformation of the shadows by bringing in
quantitative parameters that can describe the position and shape of the shadow
edge.

17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
1
The categories of this paper are: cs