Rotating black hole

Question

I know that everything that is shaped from gravity force is rotating, and gravity is a central force. but I want to know how can we detect that a black hole has an angular momentum? By which experimental sign from the black hole?

Perhaps the accretion disk surrounding the black hole will provide some insight in to the properties of the black hole. See: https://physics.stackexchange.com/questions/109993/angular-momentum-of-a-black-hole — bleuofblue, Mar 19 '22 at 23:55
Not by the redshift of the background stars: https://physics.stackexchange.com/questions/457995 — safesphere, Mar 21 '22 at 13:40

score 0 · Answer 1 · answered Jan 16 '23 at 22:34

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A rotating black hole drags spacetime outside the event horizon and so a gas emitting light close to the event horizon has redshifted light on one side of the event horizon and blueshifted light on the other

answered Jan 16 '23 at 22:34

This would be true whether the black hole was rotating or not or even in Newtonian gravity. – ProfRob Jan 17 '23 at 06:58

Rotating black hole

1 Answers1