On-Axis scalar absorption cross section of Kerr-Newman black holes: Geodesic analysis, sinc and low-frequency approximations

Abstract

We investigate null geodesics impinging parallel to the rotation axis of a Kerr-Newman black hole, and show that the absorption cross section for a massless scalar field in the eikonal limit can be described in terms of the photon orbit parameters. We compare our sinc and low-frequency approximations with numerical results, showing that they are in excellent agreement.

12 pages, 3 figures. Conference proceedings of the 4th Amazonian Symposium on Physics

References in corpus (5)

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• Imaging the Supermassive Black Hole Shadow and Jet Base of M87 with the Event Horizon Telescope
• Superradiance in static black hole spacetimes
• Low-frequency absorption cross section of the electromagnetic waves for the extreme Reissner-Nordstrom black holes in higher dimensions
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Cited by in corpus (12)

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• Moving black holes: energy extraction, absorption cross-section and the ring of fire
• On-axis scattering of scalar fields by charged rotating black holes
• 4D Einstein-Gauss-Bonnet gravity: Massless particles and absorption of planar spin-0 waves
• Gray-body factor and absorption of the Dirac field in ESTGB gravity
• Absorption by stringy black holes
• Scattering by stringy black holes
• Hairy black holes via gravitational decoupling: light rings, absorption and spectral lines
• Massive scalar wave packet emission by a charged Black Hole and Cosmic Censorship Conjecture violation