Recent content by Creedence

Rendered a video using a radial pattern in the background: It is "little" buggy (the ring inside should not be there I think), but the main effect can be seen on it. The spin parameter goes from 0.0 to 2.0 .

Which video are you talking about?

I think it's anti-aliasing, but I'm not sure. I'll try the polar chart.

The effect is indeed really small, but I could catch it:

The video I posted is OK. It's generated by my old program version. The actual one generates images with grid background. Ibix: radial lines is a good idea, thanks.

I rendered images of the BH using a square grid background. From that viewpoint the grid may get a vortex-like distortion in the case of a>0. Because of gtf ≠ 0. Or with another not so precise wording: the lightrays come from infinity and "parallel" with the rotational axis of the BH get an eφ...

Yes, this is what bugging me. I've created a simple raytracer some years ago and generated some videos, for example: . A few weeks ago I started to refactor it and fix its bugs (mostly numerical in the nonlinear computations). For some reasons the black hole is in a fixed position and the...

Where to substitute?

My question is that what is the physical meaning of the EM stress-energy tensor's eigenvectors? Thanks for the answers - Robert

How does a Kerr black hole look like from above? Is it the same as a Schwarzschild one? I could not find any convincing visualization for this question. By above I mean from a point r>0 and ϑ=0.

I know what is an event horizon (or apparent horizon in this case). My fault was that I assumed that the innermost stable photon orbit is in the EH. Thanks for the answers.

I think you suppose that the black hole is stationary. But in this case it is perturbed and changing in time. Some points get inside then leave.

In a static case. But in the case of two, rapidly moving black holes? In the case of a rapidly orbiting binary black hole the common event horizon moves very fast. It may move faster than a massive object.

I just wandering about the following hypotetical process to get some information from the inside of a black hole. 1. Drop a satellite into the black hole on a nearly tangential orbit. 2. After it crossed the event horizon drop a large mass after it (for example a small black hole). 3. This mass...

I'm searching for the list of exact stationary solutions.