When Worlds Collide: Quantum Probability from Observer Selection? [Book Review]

Foundations of Physics 33 (7):1129-1150 (2003)
In Everett's many worlds interpretation, quantum measurements are considered to be decoherence events. If so, then inexact decoherence may allow large worlds to mangle the memory of observers in small worlds, creating a cutoff in observable world size. Smaller world are mangled and so not observed. If this cutoff is much closer to the median measure size than to the median world size, the distribution of outcomes seen in unmangled worlds follows the Born rule. Thus deviations from exact decoherence can allow the Born rule to be derived via world counting, with a finite number of worlds and no new fundamental physics
Keywords many worlds  mangled  decoherence  quantum  probability
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DOI 10.1023/A:1025642019178
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Alastair Wilson (2013). Schaffer on Laws of Nature. Philosophical Studies 164 (3):653-667.

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