If a black hole rotates, how does the information about its angular momentum get passed up beyond its event horizon?
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1Possible duplicate of Black hole "no hair" theorem – ACuriousMind Oct 29 '15 at 17:24
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By frame dragging and by the shape and size of the event horizon. – CuriousOne Oct 29 '15 at 20:30
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I think it's the same reason as for the effect of mass: angular momentum is conserved and made of the properties of what is going in the BH. See from the exterior, everything seems (radially) frozen on the event horizon, and you should simply consider that this is the stuff causing the various effects you can measure from the exterior.
Fabrice NEYRET
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