> On 22 Nov 2019, at 08:35, Bruce Kellett <bhkell...@optusnet.com.au> wrote: > > I have been reading Sean Carroll's book "Something Deeply Hidden". It is more > reasonable than some of the commentary had led me to believe. The issue at > the moment is whether or not all things happen in the quantum multiverse. I > argued that just because I might turn left at some point, it does not follow > from Many-Worlds QM that in some other world I turn right.
Absolutely. That follows directly from the Schroedinger equation. That is why we take life instead of jumping out of the window! On the contrary the linearity and decoherence assures us that when we take a decision, we acts similarly in all universe, unless the decision use a quantum coin of course. > > Carroll agrees with this, despite some reports to the contrary. On page 214 > he says "No, you do not cause the wave function to branch by making a > decision.... Branching is the result of a microscopic process amplified to > macroscopic scales: a system in a quantum superposition becomes entangled > with the environment, leading to decoherence. A decision, on the other hand, > is a purely macroscopic phenomenon. There are no decisions being made by the > electrons and atoms inside your brain; they're just obeying the laws of > physics.” OK. Of course, we can branch if we desire to do so, like deciding to take the holiday in the North or in the south by untangling that decision with a quantum coin. > > So there is not a coy of me in some other branch that is typing a completely > different email at this moment..... > > Carroll also says sensible things about quantum suicide and other moral > issues. > > I was, as Brent also reported, a little surprised by his argument that it > didn't really matter whether you thought of the splitting of the wave > function/universe on a decohered quantum event as spreading at light speed, > or as instantaneous throughout the entire universe. (pp. 170-171). I think > this reflects the fact that Carroll does not seem to be as opposed to the > idea of non-locality as are other advocates of many worlds. However, he does > seem to think that the fact that outcomes of experiments are not unique in > many-worlds does deflect the impact of Bell's theorem in that theory. "That > doesn't mean that Bell's theorem is wrong in Many-Worlds; mathematical > theorems are unambiguously right. It just means that the theorem doesn't > apply. Bell's result does not imply that we have to include spooky action at > a distance in Everettian quantum mechanics, as it does for boring old > single-world theories. The correlations don't come about because of any kind > of influence being transmitted faster than light, but because of branching of > the wave function into different worlds, in which correlated things happen." > (p. 105) I agree with Carroll. I guess you don’t ... > > I think this is wrong, of course. … as you say. > The trouble with this argument is that deflecting Bell's theorem does not > automatically mean that your theory is, in fact, local. I agree on this. But why would it be non local? > And, as is usual for many-worlders, Carroll does not go on the actually spell > out how the magic of world branching actually gives rise to the observed > correlations. (He can't, of course, and that is why the issue is glossed > over.) Maudlin, on the other hand, is so pissed off with people thinking that > they can subvert Bell's theorem, that he simply states baldly that the > quantum mechanical wave function is intrinsically non-local (Philosophy of > Quantum Theory, 2019). I will wait for a proof of this statement. Bruno > > 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/4d168ac0-a956-75b4-acdf-75bbdc03275f%40optusnet.com.au. -- 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/7116A150-6397-4B70-B109-7580D9DF16C9%40ulb.ac.be.
