On Tuesday, November 27, 2018 at 8:43:35 AM UTC-6, agrays...@gmail.com wrote: > > > > On Tuesday, November 27, 2018 at 9:27:46 AM UTC, Philip Thrift wrote: >> >> >> >> On Monday, November 26, 2018 at 3:43:14 PM UTC-6, agrays...@gmail.com >> wrote: >>> >>> >>> *I checked the postulates in Feynman's Sums Over Histories (in link >>> provided by Phil) and I see nothing related to waves, as expected, and thus >>> nothing about collapse of anything. I would suppose the same applies to >>> Heisenberg's Matrix Mechanics; no waves, no collapse. I suppose you could >>> say they just produce correct probabilities, and imply nothing about >>> relative states other than their probabilities (which wave mechanics does), >>> but certainly nothing about consciousness. To summarize: you're right that >>> they are "no collapse" theories, but IMO they say nothing about >>> consciousness. AG* >>> >>>> >>>> >> >> >> In terms of the path-integral (PI) interpretation [ interesting lecture: >> https://www.perimeterinstitute.ca/videos/path-integral-interpretation-quantum-mechanics >> >> ], there is in effect no waves or wave function, just paths, or histories, >> in the sum-over-histories (SOH) terminology. >> >> There is still "decoherence" in the SOH (a single history is ultimately >> "realized"), but it could be called "selection": a single history is >> selected from the total ensemble of multiple and interfering histories. >> E.g. a single point on a screen is "hit" by a photon in the double-slit >> experiment. >> > > *Does "selection" add any insight to the measurement problem; that is, why > do we get what we get? And if not, what is its value? TIA, AG * > >> >> >> If you look at it as a "selection of the fittest" (one history surviving from an ensemble of histories), then it's like a form of quantum Darwinism. The quantum substrate is a cruel world where all histories (but one) die.

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