Everettian quantum mechanics and physical probability: Against the principle of “State Supervenience”
Jansson, Lina (2016) Everettian quantum mechanics and physical probability: Against the principle of “State Supervenience”. Studies in History and Philosophy of Modern Physics Part B: Studies in History and Philosophy of Modern Physics, 53 . pp. 45-53. ISSN 1355-2198
Everettian quantum mechanics faces the challenge of how to make sense of probability and probabilistic reasoning in a setting where there is typically no unique outcome of measurements. Wallace has built on a proof by Deutsch to argue that a notion of probability can be recovered in the many worlds setting. In particular, Wallace argues that a rational agent has to assign probabilities in accordance with the Born rule. This argument relies on a rationality constraint that Wallace calls state supervenience. I argue that state supervenience is not defensible as a rationality constraint for Everettian agents unless we already invoke probabilistic notions.
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