Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Richartz, Mauricio [1] ; Prain, Angus [2, 3] ; Liberati, Stefano [4, 5] ; Weinfurtner, Silke [6]
Número total de Autores: 4
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: Physical Review D; v. 91, n. 12 JUN 5 2015.
Citações Web of Science: 14
Resumo

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)

Processo FAPESP: 13/09357-9 - Física e geometria do espaço-tempo
Beneficiário:Alberto Vazquez Saa
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 13/15748-0 - Modelos análogos: superradiância e estabilidade
Beneficiário:Maurício Richartz
Linha de fomento: Bolsas no Exterior - Pesquisa