Spinning Kerr black hole shape?

Question

Okay, can somebody explain if a Kerr black hole has an oblate event horizon, or does it have a spherical event horizon and an oblate ergosphere?

Answer 1

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A Kerr black hole is symmetric about the axis of rotation, but both the event horizon and the ergosphere are not spherical.

The event horizon is not spherical (slightly oblate) for horribly complex reasons even though it might appear to be symmetrical due to the absence of the polar coordinate as part of the equation for the event horizon. It, of course, is not the same as the event horizon of a Schwarzschild black hole due to the additional angular momentum term.

The equation for the ergosphere is much more obvious since it explicitly contains the polar coordinate as part of the function, so it is not spherical (oblate).

Answer 2

Try the following references . . .

Source(s): https://en.wikipedia.org/wiki/Rotating_black_hole https://en.wikipedia.org/wiki/Kerr_metric https://en.wikipedia.org/wiki/Ring_singularity

Answer 3

The event horizon is shaped like a ring, not a sphere or an oblate spheroid. 

https://en.m.wikipedia.org/wiki/Ring_singularity..... 

Source(s): Google search on " what is the shape of a spinning Kerr event horizon