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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Black hole binaries: Ergoregions, photon surfaces, wave scattering, and quasinormal modes

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Author(s):
Assumpcao, Thiago [1] ; Cardoso, Vitor [2, 3, 4] ; Ishibashi, Akihiro [5, 6] ; Richartz, Mauricio [1] ; Zilhao, Miguel [3]
Total Authors: 5
Affiliation:
[1] Univ Fed ABC UFABC, Ctr Matemat Comp & Cognicao, BR-09210170 Santo Andre, SP - Brazil
[2] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5 - Canada
[3] Univ Lisbon, Inst Super Tecn, Dept Fis, CENTRA, Ave Rovisco Pais 1, P-1049 Lisbon - Portugal
[4] CERN, Theoret Phys Dept, CH-1211 Geneva 23 - Switzerland
[5] Kindai Univ, Dept Phys, Higashiosaka, Osaka 5778502 - Japan
[6] Kindai Univ, Res Inst Sci & Technol, Higashiosaka, Osaka 5778502 - Japan
Total Affiliations: 6
Document type: Journal article
Source: Physical Review D; v. 98, n. 6 SEP 18 2018.
Web of Science Citations: 5
Abstract

Closed photon orbits around isolated black holes are related to important aspects of black hole physics, such as strong lensing, absorption cross section of null particles and the way that black holes relax through quasinormal ringing. When two black holes are present-such as during the inspiral and merger events of interest for gravitational-wave detectors-the concept of closed photon orbits still exist, but its properties are basically unknown. With these applications in mind, we study here the closed photon orbits of two different static black hole binaries. The first one is the Majumdar-Papapetrou geometry describing two extremal, charged black holes in equilibrium, while the second one is the double sink solution of fluid dynamics, which describes (in a curved-spacetime language) two ``dumb{''} holes. For the latter solution, we also characterize its dynamical response to external perturbations and study how it relates to the photon orbits. In addition, we compute the ergoregion of such spacetime and show that it does not coincide with the event horizon. (AU)

FAPESP's process: 17/10641-4 - Superradiance and stability in non-axisymmetric systems
Grantee:Thiago Assumpção
Support type: Scholarships abroad - Research Internship - Master's degree
FAPESP's process: 16/00384-1 - Black holes: scattering, superradiance and stability
Grantee:Thiago Assumpção
Support type: Scholarships in Brazil - Master
FAPESP's process: 13/09357-9 - Physics and geometry of spacetime
Grantee:Alberto Vazquez Saa
Support type: Research Projects - Thematic Grants