On Mon, Nov 21, 2022 at 2:52 AM smitra <smi...@zonnet.nl> wrote: > Probability cannot be a fundamental concept in physics as explained > here: > > https://www.youtube.com/watch?v=wfzSE4Hoxbc
I'm afraid Deutsch is a bit too glib in this lecture. He hasn't, despite his best efforts, removed probability from physics. For example, in quantum mechanics, he has not explained why, if one measures the z-spin of a spin-half particle prepared in an eigenstate of x-spin, one gets only one result -- either z-spin-up or z-spin-down. If one has eliminated probability, one should be able to explain which result one gets, and why. It is no solution to say that with many-worlds, that both results are obtained by disjoint copies of the experimenter. The experimenter is just one copy, and one would have to explain the result for each individual separately. Many worlds does not explain why I, for example, see only z-spin-up and not z-spin-down. To make sense of that, we need a viable concept of probability and the Born rule. Bruce -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLQR4F3uEXO3HCPysF5Rwwr5x6NCOVZ5vk5wmiqu%2BWi8qw%40mail.gmail.com.
