One Pascal Koiran poasted something to the arXiv 9 October - a banner time for Stuff Bagestan Missed. We're hearing about it on the Drudge Report so, it is everywhere now.
The notion is to travel between two spaces in spacetime without reference to the speed of light. Einstein (and one Nathan Rosen) proposed that, yeah, relativity allows for the exit from this universe - black holes, and such. The trick is to reënter this place - the fabled "wormhole". Karl Schwarzschild noted that when you enter an event horizon, your time slows down outside the horizon such that you're not getting back into this universe ever. To reënter is, then, equivalent to the existence of such "exotic matter" as has negative mass, negative entropy, "tachyons" - whatever. It doesn't exist, therefore it's nonsense.
Ah maybe the Exotic can exist if only it be buhleeted out of existence, before you can catch it, by quantum physics! Sure, this field does allow for (and demand) particles to flicker in and out of reality. Like those W and Z bosons mediating the Weak Force. But it says nothing of "exotic" particles rather by definition - or they wouldn't be exotic, would they?
Anyway, it seems Schwarzschild isn't the last word on the topic of how to enter a (VERY THEORETICAL) wormhole. The time variable can be rethought in some "Eddington-Finkelstein metric". I don't understand it; maybe you can understand it. I assume it's still only good for data-transfer.
Leaving the universe and coming back to it would also violate causality. For some DUST episodes relevant here we could look to "Atropa", "Hyperlight", "Alone" especially and (lately) "Recoil". Overall I do not recommend the process although those stories are pretty good.
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