Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Escape probability of a photon emitted near the black hole horizon   We investigate the escape of photons from the vicinity of the horizon to
infinity in the Kerr-Newmann black hole spacetime. We assume that a light
source is at rest in a locally nonrotating frame and photons are emitted
isotropically. Then, we evaluate the escape probability of the emitted photons.
The main result of this paper is the following. If the black hole is extremal
with the nondimensional spin parameter $a_*> 1/2$, however close to the horizon
the light source would be, the escape probability remains nonzero. The
near-horizon limit value of the escape probability is a monotonically
increasing function of $a_*$ and takes a maximum $\sim$29.1\% at $a_*=1$, i.e.,
for the extremal Kerr case. On the other hand, if the black hole is extremal
with $0\leq a_*\leq 1/2$ or if the black hole is subextremal, the near-horizon
limit value is zero.

0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph