What Causes Superposition to Decoher?

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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.

Welcome to the October 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patreons, whittle them down to a more manageable number — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

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