Imagine a spin-1/2 particle described by the *superposition* psi = sqrt(1/2)[(s+)_z +(s-)_z] .
If the x-component of spin is measured by passing the spin-1/2 particle through a Stern-Gerlach with its field oriented along the x-axis, the particle will *always* emerge 'up'. Why? It is a superposition, why not MWI? > Il 16/01/2021 13:25 Pierz Newton-John <pier...@gmail.com> ha scritto: > > > > > On Sat, 16 Jan 2021 at 8:16 pm, 'scerir' via Everything List > <everything-list@googlegroups.com mailto:everything-list@googlegroups.com > > wrote: > > > > > > Pierz wrote: "If you want to argue against the internal logic of > > MWI, you have to start by accepting what it proposes then proceeding to > > demonstrate how that leads to internal inconsistency." > > > > They show that MWI is inconsistent, in the Schroedinger picture. > > https://link.springer.com/article/10.1007%2FBF00763476 > > > > > > Well that argument at least demonstrates some understanding of MWI, > unlike AG. But I don’t think it’s a good argument at all. Has the system M > decohered and thus become entangled with M’ after M measures the spin? If so, > then M and M’ are already on the same branch/ in the same world as one > another and there is only one possible measurement M’ can make. The outcome > is not subject to probability. If on the other hand, the system M has not > decohered with the common environment of M’, then M remains in a > superposition of up and down measurement states until measured by M’ and it > does not make sense to say that either the electron or M itself are in a > definite state with respect to M’. Both branches/ worlds exist and M’ has not > yet split on the outcome. It’s a pretty basic point. > > > > > > > > > > -- > > You received this message because you are subscribed to a topic in > > the Google Groups "Everything List" group. > > To unsubscribe from this topic, visit > > https://groups.google.com/d/topic/everything-list/xsl8cSDT4M8/unsubscribe. > > To unsubscribe from this group and all its topics, send an email to > > everything-list+unsubscr...@googlegroups.com > > mailto:everything-list+unsubscr...@googlegroups.com . > > To view this discussion on the web visit > > https://groups.google.com/d/msgid/everything-list/53333396.1238733.1610788558703%40mail1.libero.it > > > > https://groups.google.com/d/msgid/everything-list/53333396.1238733.1610788558703%40mail1.libero.it?utm_medium=email&utm_source=footer > > . > > > > > > > -- > 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 > mailto:everything-list+unsubscr...@googlegroups.com . > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/CAArMS02UZAEHpwcVKp%2B0GitF%3DAa-FPwBqKZUco2doyV1Z3w0jg%40mail.gmail.com > > https://groups.google.com/d/msgid/everything-list/CAArMS02UZAEHpwcVKp%2B0GitF%3DAa-FPwBqKZUco2doyV1Z3w0jg%40mail.gmail.com?utm_medium=email&utm_source=footer > . > -- 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/610945189.1243543.1610804823781%40mail1.libero.it.
