All Questions
4
questions
0
votes
2
answers
113
views
Light-like vector in Schwarzschild metric
If I shoot a light ray radially, assuming the Schwarzschild metric, what vector would I plug in to the metric tensor to get a relationship between the $t$ and $r$ coordinates? That is what vector do I ...
- 43
0
votes
1
answer
68
views
Black hole, ingoing light-like and causality
In Kruskal-Szekerers coordinates, for example, I've noticed that ingoing light-like trajectories, in the interval $ 0<r<r_s$, are decreasing in time $t$ so they travel in the past for an ...
- 496
2
votes
1
answer
494
views
Penrose spacetime diagram for the Schwarzchild solution
Consider the metric corresponding to the Schwarzchild solution. It represents a Non-rotating Black hole. When we want to understand the causal structure of the spacetime we find the null geodesic ...
- 1,124
3
votes
5
answers
838
views
How can light enter a black hole if it cannot get out?
I have known for a very long time that light cannot exit a black
hole. I can even understand some of the simpler reasonning about it,
such as escape velocity, or space geometry inside the black hole.
...
- 3,798