I.e. -- getting really sloppy and vague from my layman's POV again, in real life in quantum physics a "vacuum" is actually filled with "virtual particles", which kinda almost do exist but then don't
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Or is it more parsimonious to say that that other universe actually exists and he crossed over from there to here The first one seems a lot weirder and more arbitrary Then again, it means you're only adding one magically appearing guy to your world, not a *whole other universe*
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I'd say it's easier to accept the acasual existence of an alternate universe than the acausal existence of a person with fabricated memories of such a universe, primarily because the mechanics of person-creation are much better known and plainly contradict this possibility.
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This links to what you said earlier, because even in multiverse QM, that doesn't mean anarchy and 1=0. The interactions between universes are very small - that's what "quantum weirdness" *is* in this theory - and there's a notion of some verses being more realistic than others
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Where this notion (the "Born Rule") comes from and showing why and how quantum mechanics implies that all observers who interact with each other should agree on physical history (so no spontaneous alt-history appearances) is itself a challenge
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