Recent content by granth

Ah, I understand. Thank you.

I'm clearly misunderstanding something (which comes as no surprise to me). On page 27 of the text I linked to earlier, just below his "disabuse yourself" comment, Visser discusses the intrinsic curvature of the horizon and introduces something he calls the Ricci scalar, in order to contrast its...

Thanks for the reply. Visser's main point seems to be that the Ricci scalar varies with latitude along the horizon of a Kerr black hole, implying that the horizon's curvature is not constant. (I believe Thorne is making reference to the same thing when he says that a black hole is flat at the...

Well, that went well ... :smile: In the meantime, I found a couple of references that got me where I wanted to be: Properties of the instantaneous Ergo Surface of a Kerr Black Hole (Pelavas, Neary & Lake, 2001) The Kerr spacetime: A brief introduction (Visser, 2008) I'm cherishing this...

The event horizon of a Kerr black hole is often depicted as being spherical, but this seems to be a reference to the horizon as defined in Boyer-Lindquist coordinates, where horizons appear at a constant value of r. However, Thorne describes the "black hole's horizon bulg[ing] out at its...