Horizon instability of extremal Kerr black holes: Nonaxisymmetric modes and enhanced growth rate

Marc Casals, Samuel E. Gralla, Peter Zimmerman

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

We show that the horizon instability of the extremal Kerr black hole is associated with a singular branch point in the Green function at the superradiant bound frequency. We study generic initial data supported away from the horizon and find an enhanced growth rate due to nonaxisymmetric modes. The growth is controlled by the conformal weight h of each mode. We speculate on connections to near-extremal black holes and holographic duality.

Original languageEnglish (US)
Article number064003
JournalPhysical Review D
Volume94
Issue number6
DOIs
StatePublished - Sep 1 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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