What kind of global and causal structures does a Penrose diagram reveal?
How do I see (using a Penrose diagram) that two different spacetimes have a similar global and causal structure?
Also,
I have the following metric
$$ds^2 ~=~ Tdv^2 + 2dTdv,$$
defined for
$$(v,T)~\in~ S^1\times \mathbb{R},$$
e.g. $v$ is periodic.
This is the according Penrose diagram:
Is the Penrose diagram that I have drawn correct?
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