One of the more interesting cosmological notions of recent decades is the multiverse… the notion that there are parallel or alternate realities out there *somewhere.* Every bit as real as our reality, but severed from it and unreachable. The concept works with some aspect of quantum mechanics and such, but in order to be a truly scientific concept, as opposed to philosophical armwaving, it needs to be testable. But how do you test for other universes, when you don’t have stargates or transporters into mirror universes?
Is the universe a bubble? Let’s check: Making the multiverse hypothesis testable
One proposed approach: simulate the entire universe. Then simulate another one. And whack ’em together and see what the simulations say you should see… then look for those traces in the universe at large. One suggested sign of a collision between universes would leave circular features on the cosmic background radiation. Such signs have not yet been found.
Of course, this would require that other universes are in “bubbles” that could interact with ours. When dealing with something like this, though, it seems to me that there could well be alternate realities that are fundamentally different from that, existing well apart across other dimensions currently unimagined.
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