Shadow and near-horizon characteristics of the acoustic charged black hole in curved spacetime

Ling, Ru; Guo, Hong; Liu, Hang; Kuang, Xiao-Mei; Wang, Bin

doi:10.1103/PhysRevD.104.104003

Shadow and near-horizon characteristics of the acoustic charged black hole in curved spacetime

Ru Ling
(
- Yangzhou U.
)
,
Hong Guo
(
- Yangzhou U. and
- Shanghai Jiaotong U.
)
,
Hang Liu
(
- Yangzhou U. and
- Shanghai Jiaotong U.
)
,
Xiao-Mei Kuang
(
- Yangzhou U.
)
,
Bin Wang
(
- Yangzhou U. and
- Shanghai Jiaotong U.
)

Jul 11, 2021

22 pages

Published in:

Phys.Rev.D 104 (2021) 10, 104003

Published: Nov 1, 2021

e-Print:

2107.05171 [gr-qc]

DOI:

10.1103/PhysRevD.104.104003 (publication)

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Abstract: (APS)

In this paper, we first analyze the horizon structure of the acoustic charged black hole in curved spacetime and then study its acoustic shadow as well as the near-horizon characteristics including the quasinormal mode (QNM) frequencies and analog Hawking radiation. We find that the radius of the acoustic shadow for an acoustic charged black hole is larger than that for a Reissner-Nordström (RN) black hole, and both of them are suppressed by increasing the black hole charge because their related outer horizons become smaller. Then the QNM frequencies under scalar field perturbation and its eikonal limit are computed via numeric method and acoustic shadow, respectively. We find that the acoustic charged black hole is stable under the perturbation and the QNM frequencies are much weaker than that for the astrophysical black hole. Moreover, as the tuning parameter increases, the perturbation oscillates more mildly and its damping time becomes longer, while as the charge increases, the oscillation is enhanced slightly and the perturbation decays a little faster which is different from that in a RN black hole. Finally, we numerically study the analog Hawking radiation. We find that the gray-body factor and energy emission rate are suppressed by the angular number and the charge, but they do not monotonically depend on the tuning parameter in the acoustic charged black hole. The behavior of the energy emission rate affected by the parameters could be explained by the dependent behavior of the Hawking temperature. We expect that our results could shed light to the study of black holes in both theoretical and experimental perspectives.

Note:

Published version

black hole: charge
energy: flux
radiation: Hawking
quasinormal mode: frequency
perturbation: decay
black hole: stability
temperature: Hawking
field theory: scalar
acoustic
space-time

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