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by wavegeek
2181 days ago
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> The correct formulation involves the subtle concept of decoherence. The trouble is that decoherence only explains part of the story. With decoherence you end up with the probability density converging into multiple outcomes. But decoherence does not in any way explain that the choice is made to pick one of these outcomes. As for what is wrong with QM, the main issue for me is the measurement process, which is just posited axiomatically. How measurement works should be explained by the theory but it is just posited. They assume a classical device that does the measurement. Decoherence explains bits of it but much is left hanging loose. |
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As you mention, the probability density converges to multiple outcomes, but then I believe that you're in more of an Everett Many Worlds between the outcomes, rather than a "choice."
In practice, it seems like all of the Many Worlds scenarios statistically converge into one world sooner or later anyways (would love this to be formally shown, but have never seen it, so it's just conjecture from me). For example, if you flip a quantum coin, splitting the universe in two in a Many Worlds Interpretation, who cares? Does the Sun notice? Does someone in a town a mile away?
You've created a small bubble of "two universes," in a Many Worlds sense, but that bubble will pop. Quantum mechanics is ambivalent about the direction of time, so it sure seems like worlds are joining as fast as they're splitting, keeping us statistically around one effective universe.