mormon1 comments on Why Many-Worlds Is Not The Rationally Favored Interpretation - Less Wrong
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What happens when I measure an entangled particle at A after choosing an orientation, you measure it at B, and we're a light-year apart, moving at different speeds, and each measuring "first" in our frame of reference?
Why do these so-called "probabilities" resolve into probabilities when I measure something, but not when they're just being microscopic? When exactly do they resolve? How do you know?
Why is the wavefunction real enough to run a quantum computer but not real enough to contain intelligences?
These are all questions that must be faced by any attempted single-world theory. Without specific evidence pointing to a single world, they are not only lethal for the single-world theory but lethal for anyone claiming that we have good reason to think about it.