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Where is the extremal Kerr ISCO?
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.Comment: 6 pages; v2: minor cosmetic changes; coincides with published versio
Kelly James Clark and Raymond VanArragon , Evidence and Religious Belief, oxford University Press, 2011
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