Scalar perturbations of Kerr-AdS black holes

Nami Uchikata, Shijun Yoshida, Toshifumi Futamase

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


We numerically study the scalar perturbation of a rotating black hole in anti-de Sitter spacetime (Kerr-AdS black hole). It is found that small Kerr-AdS black holes characterized by r+□0.16ℓ are unstable against scalar perturbations via the superradiant amplification mechanism for some rotation rates, where r+ and ℓ stand, respectively, for the radial coordinate value of the black hole event horizon in the Boyer-Lindquist coordinates and the cosmological length-scale, defined by ℓ=(-3/Λ)1/2. Here Λ is the (negative) cosmological constant.

Original languageEnglish
Article number084020
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number8
Publication statusPublished - 2009 Oct 15

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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