All Questions
5
questions
1
vote
1
answer
67
views
Is pp-wave spacetime strongly causal?
Is pp-wave spacetime, strongly casual?
If not, where is it on the causal ladder?
- 1,268
1
vote
1
answer
44
views
A question on the causal hierarchy/ladder and the existence of CTC
What does the existence of CTC imply for the Causal Structure of the spacetime?
Can a strongly causal spacetime have any CTC[without fluctuating the metric]?
Is there any such example?
Can someone ...
- 1,268
1
vote
1
answer
96
views
When a curve is future (past) inextendible?
Future (past) endpoint: We say that $p\in M$ is a future (past) endpoint of a curve $\lambda$ if for every neighborhood $O$ of $p$ there exists a $t_0$ such that
$\lambda(t)\in O$ for all $t>t_0$ (...
- 27
-1
votes
2
answers
1k
views
Is the future predetermined and fixed? [closed]
I just watched a YouTube video which explained that life as a sequence of events is a geometric object in the four-dimensional spacetime and that the future is not only predetermined, but it already ...
- 109
0
votes
1
answer
302
views
Is gravity instantaneous? [duplicate]
I want to know if (hypothetically) a star appears out of nowhere at a certain distance (say 20 light seconds) away from me, how long will it take for me to get the feel of it's gravity? Will I know it ...
- 141