I have a long-standing question regarding the fundamental nature of macroscopic QM in combination with MWI.(adsbygoogle = window.adsbygoogle || []).push({});

First, generally speaking, what does the Born rule say about macroscopic objects and experiments (without superfluids and other traditional examples of quantum behavior on the large scale)? It seems that events around us evolve deterministically, that we can predict the future with much accuracy. In reality, if every variable was known would the Born rule give a 99.9999 probability for a specific outcome that would be considered a normal sequence in classical mechanics?

Which leads me to MWI. If every possibility occurs in that interpretation, does that mean that at each macroscopic branching point there is a 99.999% probability outcome and every other branch is a low probability/amplitude one which can be regarded as a fluctuation from the classical mechanics sequence? And that's why we never observe those low probability events but only high probability branches and outcomes.

Thanks in advance.

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# I MWI and macroscopic probability

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