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- TL;DR Summary
- Could a rotating extended body exceed that limit?
The Schwarzschild metric seems to model, for example, the earth’s gravity field above the earth’s surface pretty well, even though the Earth is not really a golf-ball sized black hole down at the center. Can the same be said for the Kerr metric? Does it model a rotating extended body’s gravity field well above that body’s surface?
(I am wondering about the magnitude of the angular momentum of that extended body versus that of the Kerr black hole. Isn’t there a limit to how much angular momentum the black hole can have, and might the extended body have more than that limit? Or is that not possible?)
(I am wondering about the magnitude of the angular momentum of that extended body versus that of the Kerr black hole. Isn’t there a limit to how much angular momentum the black hole can have, and might the extended body have more than that limit? Or is that not possible?)