- #1

jbergman

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- TL;DR Summary
- In real QM experiments we see outcomes that align with the Born rule. How is such a phenomenon justified in a Many Worlds Interpretation?

I hate to bring up an old saw again, but I've been listening to Carroll and some others wax poetically about Many Worlds. And Jurek's work on decoherence and pointer states seem to address some of the problems with the MWI.

However, I haven't seen any compelling explanation as to why an observer in this universe would see experimental results consistent with the Born rule.

If you do a repeated spin up or down measurement 3 times you will have 8 different worlds where each observer will have seen some distinct combination of outcomes, {UUU, UUD, UDU, UDD, DDD, DDU, DUD, DUU} which seems to suggest that there is an equal probability of any outcome even if the preparation is such that the magnitude of the |U> coefficient has a magnitude of say .95.

I haven't seen any explanation that convincingly addresses this question and it seems like the Born Rule statistics are fundamentally at odds with what one would expect to experience if MWI were true.

However, I haven't seen any compelling explanation as to why an observer in this universe would see experimental results consistent with the Born rule.

If you do a repeated spin up or down measurement 3 times you will have 8 different worlds where each observer will have seen some distinct combination of outcomes, {UUU, UUD, UDU, UDD, DDD, DDU, DUD, DUU} which seems to suggest that there is an equal probability of any outcome even if the preparation is such that the magnitude of the |U> coefficient has a magnitude of say .95.

I haven't seen any explanation that convincingly addresses this question and it seems like the Born Rule statistics are fundamentally at odds with what one would expect to experience if MWI were true.