Quote:
Originally Posted by [1ponders]
Ok I think I can visualize that.
Maybe you can explain to me then what the momentum is 'conserved' to. I mean when in our 'normal' spacetime I can get it. Like a spinning skater pulling in their arms. But is there actually anything there with a singularity? Is the singularity 'real' as I would understand it? If its not then where does the momentum get conserved to?
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Rotating black holes can only carry a maximum angular momentum which is related to the mass of the black hole. If the angular momentum exceeds this limit, the two event horizons merge and become smaller than the ring singularity.
This is known as a "naked singularity" as the singularity should be observable as it is no longer hidden inside an event horizon.
Unfortunately this is where the esoteric mathematics of Messrs. Hawking and Penrose comes into play. Directly observing a naked singularity results in violation of causality. Hence black holes with exposed singularities don't exist. Not all scientists however agree with this theory. So at this stage we can't make any conclusions on the "reality" of a singularities as they cannot be observed due to the event horizons.
With regards to the second part of your question consider a spinning black hole with maximum angular momentum. If it interacts with another spinning black hole the excess angular momentum is converted into gravitational waves.
The search for gravitational waves is one of the ongoing activities in physics.
The angular momentum of a black hole can also be conserved (transferred) to particles in the accretion disk.
Regards
Steven