In 3+1 dimensional general relativity, all black holes must be topologically equivalent to a sphere. However in 4+1 dimensional gravity, this isn't the case, there Torus shaped black holes are possible. Can someone explain intuitively why "black rings" are possible in 4+1 dimensional gravity? I think I get my it's possible, any my explanation is dues to the fact that in 4+1 dimensional gravity, the event horizon should be proportional to the Square root of the mass, but I'm not sure how accurate I am.
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