Axion corrections to photon superradiant scattering by Kerr black holes
Abstract
We study photon superradiant scattering by a Kerr black hole in the presence of an axion-photon coupling and investigate how this coupling modifies the electromagnetic amplification factor. We solve the coupled axion and electromagnetic equations in a fully relativistic framework. We distinguish two regimes according to the relation between the sourced axion frequency and the axion mass. In the radiative regime, the axion can propagate to spatial infinity and carry away energy, thereby suppressing photon amplification. In the subthreshold regime, the axion is confined by the mass barrier and exchanges energy with the black-hole horizon through quasibound-state excitations. In this regime, photon amplification can be either enhanced or suppressed, depending on whether the relevant axion modes satisfy the superradiance condition.
Related
- NNLO QED corrections and inelastic two-photon exchange in elastic lepton-proton scattering with McMule
- Coherent quantum state corrections in RN–black holes: Photon dynamics, shadow casts, and energy backreaction
- Radiative Corrections to Elastic Lepton-Proton Scattering with Focus on Two-Photon-Exchange Diagrams
- Black hole thermodynamics and KK photon quantum corrections in 2D effective dilaton gravity
- Coherent quantum state corrections in RN--black holes: Photon dynamics, shadow casts, and energy backreaction
BibTeX
@misc{zhu2026axion,
title = {{Axion corrections to photon superradiant scattering by Kerr black holes}},
author = {Zhi-Qing Zhu and Jun Zhang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.40166},
eprint = {2609.40166},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.40166},
}
RIS
TY - UNPB
TI - Axion corrections to photon superradiant scattering by Kerr black holes
AU - Zhi-Qing Zhu
AU - Jun Zhang
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.40166
UR - https://arxiv.org/abs/2609.40166
AB - We study photon superradiant scattering by a Kerr black hole in the presence of an axion-photon coupling and investigate how this coupling modifies the electromagnetic amplification factor. We solve the coupled axion and electromagnetic equations in a fully relativistic framework. We distinguish two regimes according to the relation between the sourced axion frequency and the axion mass. In the radiative regime, the axion can propagate to spatial infinity and carry away energy, thereby suppressing photon amplification. In the subthreshold regime, the axion is confined by the mass barrier and exchanges energy with the black-hole horizon through quasibound-state excitations. In this regime, photon amplification can be either enhanced or suppressed, depending on whether the relevant axion modes satisfy the superradiance condition.
ER -