Absorption of electromagnetic and gravitational waves by Kerr black holes: Shadows, superradiance and the spin-helicity effect
arXiv:1707.01144 · doi:10.1016/j.physletb.2017.09.048
Abstract
We study the absorption of plane waves by Kerr black holes. We calculate the absorption cross section: the area of the black hole shadow at a finite wavelength. We present a unified picture of the absorption of all massless bosonic fields, focussing on the on-axis incidence case. We investigate the spin-helicity effect, arising from a coupling between dragging of frames and the helicity of a polarized wave. We introduce and calibrate an extended sinc approximation which provides new quantitative data on the spin-helicity effect in strong-field gravity.
5 pages, 3 figures
References in corpus (6)
- Imaging the Schwarzschild-radius-scale Structure of M87 with the Event Horizon Telescope using Sparse Modeling
- Scattering and absorption of gravitational plane waves by rotating black holes
- Gravitational perturbations of the Kerr geometry: High-accuracy study
- Imaging the Supermassive Black Hole Shadow and Jet Base of M87 with the Event Horizon Telescope
- The Event Horizon Telescope: exploring strong gravity and accretion physics
- Superradiance in the sky
Cited by in corpus (9)
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- Absorption by black hole remnants in metric-affine gravity
- Rainbow scattering of gravitational plane waves by a compact body
- Schwarzschild-like black holes: Light-like trajectories and massless scalar absorption
- On-axis scattering of scalar fields by charged rotating black holes
- Absorption by deformed black holes
- Series reduction method for scattering of planar waves by Kerr-Newman black holes
- Scattering of massless bosonic fields by Kerr black holes: On-axis incidence
- Analytical investigation of wave absorption by a rotating black hole analogue