Superradiant instabilities in black hole systems

Óscar J.C. Dias, Vitor Cardoso, José Lemos, Shijun Yoshida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A wave impinging on a Kerr black hole can be amplified as it scatters off the hole if certain conditions are satisfied. This is known as superradiant scattering. By building a mirror around the black hole one can make the system unstable. This is the black hole bomb of Press and Teukolsky. We investigate in detail this process and compute the growing timescales and oscillation frequencies as a function of the mirror's location. It is found that in order for the system, black hole plus mirror, to become unstable there is a minimum distance at which the mirror must be located. We also show with an explicit example that such a bomb can be built, once an appropriate black hole is located. Now, a spacetime with a "mirror" naturally incorporated in it is anti-de Sitter (AdS) spacetime, since the AdS space behaves effectively as a box with a reflecting gravitational wall at its infinity. Thus, a small Kerr-AdS black hole is naturally unstable to superradiant scattering of a wave that is generated in its vicinity.

Original languageEnglish
Title of host publicationNew Worlds in Astroparticle Physics - Proceedings of the 5th International Workshop
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages252-258
Number of pages7
ISBN (Print)9812566252, 9789812566256
Publication statusPublished - 2006 Jan 1
Externally publishedYes
Event2005 5th International Workshop on New Worlds in Astroparticle Physics - Faro, Portugal
Duration: 2005 Jan 82005 Jan 10

Publication series

NameNew Worlds in Astroparticle Physics - Proceedings of the 5th International Workshop

Other

Other2005 5th International Workshop on New Worlds in Astroparticle Physics
CountryPortugal
CityFaro
Period05/1/805/1/10

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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