Recent content by erasrot

Before answering your question, please, allow me one more: how does that picture is different from what happen for any other sufficiently compact (but not BH) object?

Thank you. I reached the same conclusion just looking at the corresponding Penrose diagram. And I think it also leads to the conclusion that no observer (asymptotic or free falling) is able to actually see the formation of a black hole, even if the collapse happen in a finite amount of his...

Ok, I will assume it is correct that in Schwarzschild spacetime the difference between the proper times of any two free falling observers is finite. Would it means that any such an observer sees that the collapse ends after a finite amount of his proper time?

Thanks for your answer. Do you mean that they are not vaccuum solutions because, to be a solution, the conical singularity at r=0 has to be treated as a point particle?

Ok, let me be sure I understand this properly. Timelike geodesics are timelike everywhere in Schwarzschild spacetime (in the manifold, i.e., independent of the given chart), including the region inside the EH. This spacetime is geodesically incomplete, what implies that the affine parameter for...

Hi everybody. I am well aware that there is only one black hole in 2+1, i.e., the BTZ one. I also know that for vanishing and positive cosmological constants we get solutions with a conical singularity. My question is more about the interpretation of these last results. Assume that in the BTZ...

I hope you find this question related with this thread topic. Let us assume that all the ideal conditions for the Oppenheimer-Snyder collapse are met, does it ever stop for any observer?