Where is the extremal Kerr ISCO?
arXiv:1107.5081 · doi:10.1088/0264-9381/28/18/187001
Abstract
Although the circular photon orbit and ISCO for the Kerr black hole remain distinct from each other and from the horizon in the extremal spin limit on a constant Boyer-Lindquist time slice, on a horizon-crossing slice they both coincide with the null generators of the horizon.
6 pages; v2: minor cosmetic changes; coincides with published version
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