Particle on the innermost stable circular orbit of a rapidly spinning black hole

Samuel E. Gralla, Achilleas P. Porfyriadis, Niels Warburton

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

We compute the radiation emitted by a particle on the innermost stable circular orbit of a rapidly spinning black hole both (a) analytically, working to leading order in the deviation from extremality and (b) numerically, with a new high-precision Teukolsky code. We find excellent agreement between the two methods. We confirm previous estimates of the overall scaling of the power radiated, but show that there are also small oscillations all the way to extremality. Furthermore, we reveal an intricate mode-by-mode structure in the flux to infinity, with only certain modes having the dominant scaling. The scaling of each mode is controlled by its conformal weight, a quantity that arises naturally in the representation theory of the enhanced near-horizon symmetry group. We find relationships to previous work on particles orbiting in precisely extreme Kerr, including detailed agreement of quantities computed here with conformal field theory (CFT) calculations performed in the context of the Kerr/CFT correspondence.

Original languageEnglish (US)
Article number064029
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number6
DOIs
StatePublished - Sep 21 2015
Externally publishedYes

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Particle on the innermost stable circular orbit of a rapidly spinning black hole'. Together they form a unique fingerprint.

Cite this