That analogy also implies that space wraps around, which no experiment has ever shown to be true. This contradiction is why I have trouble.
It’s a good analogy otherwise, but the details are the interesting part.
Haven't read the paper but one likely could tell from the density.
> That analogy also implies that space wraps around, which no experiment has ever shown to be true.
It's an analogy meant to highlight one particular aspect, not be a perfect model of spacetime. In mathematics, there is no shortage of topological objects that are infinite but not closed otherwise.