From: *smitra* <[email protected] <mailto:[email protected]>>
It may look like one can re-interpret QM as being consistent with Einstein realism, but Bell disproved this (if you assume locality). Note also what Bruce said about "simultaneously". My own idea is that we need to think about how to interpret time evolution, instead of making all this fuss about superpositions. Without collapse, the time evolution of a system can be interpreted as a simple change of basis. You still have access to the initial state, at least in theory. But if the system collapses (in the MWI this is then an effective collapse due to you getting entangled with the system), you cannot access the initial state anymore (in practice, you might not have been able to do that anyway).
I think this is the important observation for MWI vs collapse. In MWI, entanglement of the observer with the system is an effective collapse -- one no longer has access to either the initial state or to the other branches of the superposition. This is the heart of Bruno's FPI, and it means that MWI is only of philosophical interest -- it cannot have any relevance as an explanation of experience.
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