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dlthomas comments on Collapse Postulates - Less Wrong
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If you take the MWI literally, each world splits all the time, so the number of worlds would increase. Of course, there is no point counting what we cannot observe, not even in principle.
Depends on what you mean by that. But yes, one can certainly express the MWI in a way that preserve unitarity over multiple worlds.
Probably not in this sense. The world splitting process ought to be a tree graph, with no cycles. Scott Aaronson explains it better.
You may want to ponder how rational it is to refer to an exciting idea that was never fleshed out as if it were a real physical model.
My understanding is "Yes, but only if the resulting 'present' configurations are identical, which basically never happens when things get big."
That's what Scott says, yes. There is related to Poincare recurrence, something that happens probably just as often as two worlds combining.