Where is the extremal Kerr ISCO?
classification
🌀 gr-qc
hep-th
keywords
extremalhorizoniscokerrslicealthoughblackboyer-lindquist
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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.
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