The physics of black hole binaries: geodesics, relaxation modes and energy extraction

Article
Report number	arXiv:1905.05204
Title	The physics of black hole binaries: geodesics, relaxation modes and energy extraction
Author(s)	Bernard, Laura (Perimeter Inst. Theor. Phys. ; LUTH, Meudon) ; Cardoso, Vitor (Lisbon, CENTRA ; CERN) ; Ikeda, Taishi (Lisbon, CENTRA) ; Zilhão, Miguel (Lisbon, CENTRA)
Publication	2019-08-02
Imprint	2019-05-13
Number of pages	9
Note	6 pages, RevTex4. v2: Addition of Supplemental Material, with substantial further evidence for the universality of binary ringdown, and convergence studies of our numerical results. Accepted in Physical Review D
In:	Phys. Rev. D 100 (2019) 044002
DOI	10.1103/PhysRevD.100.044002
Subject category	astro-ph.HE ; Astrophysics and Astronomy ; gr-qc ; General Relativity and Cosmology
Abstract	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 properties go hand in hand, as they did for isolated black holes. The binary quasinormal modes have high quality factor and may be prone to resonant excitations. Finally, we show that energy extraction from binaries is generic and we find evidence of a new mechanism -- akin to the Fermi acceleration process -- whereby the binary transfers energy to its surroundings in a cascading process. The mechanism is conjectured to work when the individual components spin, or are made of compact stars.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2019-2024 authors (License: CC-BY-4.0)

$Total energy in a scalar field inside a cavity composed of a circular reflecting boundary and two reflecting circles in circular orbit around each other. The boundary radius is $R_{\rm ext}=30$, each object has a radius $0.5$ and is on a circular orbit of radius $5$ with angular velocity $\Omega=0.14$.$ $Radial dependence of the waveform shown in Fig.~\ref{Fig_transient_binaries} of the main text (BHB3) for the $l=m=0$ (top) and $l=2, m=0$ (bottom) modes. Here, we aligned the waveform extracted at three different radii, by properly subtracting the light travel time. As we can see there's a very good overlap of the waveform for the $l=2$ mode, indicating that it is purely outgoing and that one is indeed in the wave zone already and capturing the leading order dependence of the waveform. The driving $l=0$ mode, on the other hand, is not aligned at early times, showing that indeed it is initially ingoing.$ $Radial dependence of the waveform shown in Fig.~\ref{Fig_transient_binaries} of the main text (BHB3) for the $l=m=0$ (top) and $l=2, m=0$ (bottom) modes. Here, we aligned the waveform extracted at three different radii, by properly subtracting the light travel time. As we can see there's a very good overlap of the waveform for the $l=2$ mode, indicating that it is purely outgoing and that one is indeed in the wave zone already and capturing the leading order dependence of the waveform. The driving $l=0$ mode, on the other hand, is not aligned at early times, showing that indeed it is initially ingoing.$ Show more plots

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Record creato 2019-06-12, modificato l'ultima volta il 2023-12-13

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