Quote:
Originally Posted by Robh
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Rob,
The distortion of the event horizon is a property of angular momentum not gravity. In the case of dynamical black holes one needs to consider the angular momentum of the black holes rotating around a centre of mass.
Consider the effects of intrinsic angular momentum on horizons.
A Kerr black hole is a rotating black hole and has
2 horizons, one is similar to the Schwarzschild event horizon, the other is is a flattened sphere that extends out from the equatorial region of the black hole. The faster the black hole rotates the greater the dimensional change effects on each horizon.
A general statement about the effect of angular momentum on horizons is also found in your reference under "Black hole parameters".
Regards
Steven