http://realityconditions.blogspot.com/2006/09/on-price-and-penrose-on-time-asymmetry_18.html" [Broken] is a very interesting discussion of a proposal to allow backward causation in quantum mechanics. The basic idea is that the time asymmetry of QM ("collapse of the wave function") violates our expectations of a fundamental theory; all previous candidates from Newton on have been time symmetric and time asymmetry then arises from statistical probabilities. The ideas are discussed back and forth in a refreshing way, and I strongly recommend it.(adsbygoogle = window.adsbygoogle || []).push({});

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# Causality in QM

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