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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.)

Rotating black holes in a draining bathtub: Superradiant scattering of gravity waves

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Richartz, Mauricio [1] ; Prain, Angus [2, 3] ; Liberati, Stefano [4, 5] ; Weinfurtner, Silke [6]
Total Authors: 4
[1] Univ Fed ABC UFABC, Ctr Matemat Comp & Cognicao, BR-09210170 Santo Andre, SP - Brazil
[2] Bishops Univ, Dept Phys, Quebec City, PQ J1M 1Z7 - Canada
[3] Bishops Univ, STAR Res Cluster, Quebec City, PQ J1M 1Z7 - Canada
[4] SISSA Int Sch Adv Studies, I-34136 Trieste - Italy
[5] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste - Italy
[6] Univ Nottingham, Sch Math Sci, Nottingham NG7 2RD - England
Total Affiliations: 6
Document type: Journal article
Source: Physical Review D; v. 91, n. 12 JUN 5 2015.
Web of Science Citations: 14

In a draining rotating fluid flow background, surface perturbations behave as a scalar field on a rotating effective black hole spacetime. We propose a new model for the background flow which takes into account the varying depth of the water. Numerical integration of the associated Klein-Gordon equation using accessible experimental parameters shows that gravity waves in an appropriate frequency range are amplified through the mechanism of superradiance. Our numerical results suggest that the observation of this phenomenon in a common fluid mechanical system is within experimental reach. Unlike the case of wave scattering around Kerr black holes, which depends only on one dimensionless background parameter (the ratio a/M between the specific angular momentum and the mass of the black hole), our system depends on two dimensionless background parameters, namely the normalized angular velocity and surface gravity at the effective black hole horizon. (AU)

FAPESP's process: 13/15748-0 - Analogue Models: superradiance and stability
Grantee:Maurício Richartz
Support Opportunities: Scholarships abroad - Research
FAPESP's process: 13/09357-9 - Physics and geometry of spacetime
Grantee:Alberto Vazquez Saa
Support Opportunities: Research Projects - Thematic Grants