# Physics of black hole binaries: Geodesics, relaxation modes, and energy extraction

@article{Bernard2019PhysicsOB, title={Physics of black hole binaries: Geodesics, relaxation modes, and energy extraction}, author={L. Bernard and Vitor Cardoso and Taishi Ikeda and Miguel Zilh{\~a}o}, journal={Physical Review D}, year={2019} }

Black holes are the simplest macroscopic objects, and provide unique tests of General Relativity. They have been compared to the Hydrogen atom in quantum mechanics. Here, we establish a few facts about the simplest systems bound by gravity: black hole binaries. We provide strong evidence for the existence of `global' photosurfaces surrounding the binary, and of binary quasinormal modes leading to exponential decay of massless fields when the binary spacetime is slightly perturbed. These two…

## 12 Citations

Response of ultralight dark matter to supermassive black holes and binaries

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Scalar fields can give rise to confined structures, such as boson stars or $Q$-balls. These objects are interesting hypothetical new ``dark matter stars,'' but also good descriptions of dark matter…

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Deep conceptual problems associated with classical black holes can be addressed in string theory by the “fuzzball” paradigm, which provides a microscopic description of a black hole in terms of a…

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Black holes found in binaries move at very high velocities relative to our own reference frame and accelerate due to the emission of gravitational radiation. Here, we investigate the numerical…

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The use of modern effective field theory techniques has sparked significant developments in many areas of physics, including the study of gravity. Case in point, such techniques have recently been…

Superradiant scattering by a black hole binary

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I present evidence of a novel guise of superradiance that arises in black hole binary spacetimes. Given the right initial conditions, a wave will be amplified as it scatters off the binary. This…

Strong-field gravitational lensing by black holes

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In this thesis we study aspects of strong-field gravitational lensing by black holes in general relativity, with a particular focus on the role of integrability and chaos in geodesic motion. We first…

Black hole binaries and light fields: Gravitational molecules

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We show that light scalars can form quasibound states around binaries. In the nonrelativistic regime, these states are formally described by the quantum-mechanical Schr\"odinger equation for a…

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- 2021

We study gravitational wave (GW) emission in the strong-field regime by a hierarchical triple system composed of a binary system placed in the vicinity of a supermassive black hole (SMBH). The…

Evolution of black hole shadows from superradiance

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Black holes have turned into cosmic laboratories to search for ultra-light scalars by virtue of the superradiant instability. In this paper we present a detailed study of the impact of the…

Scattering of uncharged particles in the field of two extremely charged black holes

- PhysicsGeneral Relativity and Gravitation
- 2019

We investigate the motion of uncharged particles scattered by a binary system consisting of extremely charged black holes in equilibrium as described by the Majumdar-Papapetrou solution. We focus on…

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