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Originally Posted by Charlatan
I don't know enough about the theories of the multiverse but what little I do understand suggests that these choices only exist at the quantum level and collapse as they get larger due to choice.
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No mechanism with predictive power has been proposed that could result in Quantum-level superimposition not happening at larger scales.
Observations of the large-scale universe are consistent with Quantum-level superimposition happening at larger scales. Large-scale cross-connected systems can have superimposition, but the large-scale seperate superimposed states rapidly become orthogonal, and cannot communicate with each other.
There is the possibility that some unknown effect causes quantum collapse. I've seen gravity proposed as a cause of quantum collapse, as well as some kind of super special physical effect of "awareness".
Carefully insulated particles (avoiding the cross-connection-with-rest-of-universe problem) have generated quantum superimposition and entanglement effects on macroscopic scales.
Of course, that is just a layman's opinion. Most professional physicists I've talked to simply avoid the question by saying "Q-M cannot be used to predict macroscopic system behaviour, so we don't use Q-M on macroscopic systems".
