How does rotation affect a black holes shape?
Yes it does. In general relativity, there are several basic types of black holes: Schwarzschild Black Holes…which do not rotate, and are exactly spherical. They are defined to us external observers by an Event Horizon whose size depends only on the mass of the black hole according to: Radius = GM/c^2 or about 2.6 kilometers for each solar mass of material. Kerr Black Holes which possess non-zero angular momentum, meaning that they are rotating. They superficially resemble Schwarzschild black holes except that space-time outside the outer event horizon is not static because of the so-called Lenz-Tirring effect of ‘frame dragging’. This causes the axis of an orbiting gyroscope to shift slightly after each complete orbit. All rotating, massive objects also have this phenomenon but to a lesser degree. The interior of Kerr black holes is complicated and does not look the same to an observer entering from the poles or from the equator. The singlarity is not ‘point-like’ but is a ring that
