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this post was submitted on 28 Sep 2023
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The black hole and the stuff outside it constitute a single system, and within that system, angular momentum is conserved. So as objects cross the event horizon, their angular momentum is transferred to the black hole.
Well.... does it? If all the stuff falls in and only the volume remains, who could say that it's spinning? How could you detect it?
For one thing, the size and shape of the event horizon change depending on the black hole’s spin.
What would happen if one were to stop spinning? Could one even stop spinning?
Yes—it’s called the Penrose process.