Astronomers Discover a Supermassive Black Hole Rotating at Half Speed of Light(motherboard.vice.com)
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Astronomers Discover a Supermassive Black Hole Rotating at Half Speed of Light
https://motherboard.vice.com/en_us/article/7xyg9d/astronomers-discover-a-supermassive-black-hole-rotating-at-half-the-speed-of-light
5 comments
Is there a 1:1 relationship between the rotational speed of the black hole itself and the speed of the matter falling into it? If matter would fall straight (with 0 angular momentum) towards a rotating black hole, would its matter fall in straight, or would the black hole drag the matter into rotation?
The latter. Unlike Schwarzschild black holes, a Kerr black hole drags spacetime with it as it rotates.
The black hole in Interstellar was a Kerr black hole.
https://en.wikipedia.org/wiki/Kerr_metric
The black hole in Interstellar was a Kerr black hole.
https://en.wikipedia.org/wiki/Kerr_metric
pure speculation but I would assume space around that black hole would act like a vortex, like water going down the drain. so anything get close will be dragged I guess.
I have a theoretical question: Since events horizon is not a real object, can the tangencial speed at the equator be greater than the speed of light?
I understand that matter does not necessarily enter at very close to a tangential angle, and only the tangential component would contribute to rotation, but it seems like most of it must, in practice.
Clue?