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What Causes Superposition to Decoher?
There could be a lot of universes, but whether the number of universes is infinite is a technical thing that we don't really know about. But yes, if you believe in many worlds and you think that the origin of cosmic perturbations is in quantum fluctuations in the early universe, then there absolutely are other universes out there where the distribution of quantum fluctuations was different. So what caused superposition to deco here? Same thing as always does.