> On 20 Aug 2018, at 01:23, Bruce Kellett <bhkell...@optusnet.com.au> wrote: > > From: <agrayson2...@gmail.com <mailto:agrayson2...@gmail.com>> >> On Sunday, August 19, 2018 at 11:36:47 AM UTC, Bruce wrote: >> From: Bruno Marchal <mar...@ulb.ac.be <>> >>> Yes. My feeling is that you do introduce some preferred base. >> >> Yes, your feelings are very much at fault here. If you thought a bit rather >> than go with feelings, we might be better off. I do not introduce a >> preferred basis. Where do you think I do that? You argue against a straw >> man, as usual. A typical base is not a preferred base. >> >> Since you could have chosen u - d and u + d as the basis, cannot u and d be >> considered a preferred basis? AG > > The (u-d), (u+d) base is just a 90 degree rotation of the u,d base. It could > be relevant if you oriented your magnets that way rather than in the u,d > direction. As usual, Bruno has muddied the waters here by introducing the > idea that |u> and |d> form a preferred basis.
Only for those who interpret ud-du as a superposition of ud and du, when it describes an infinity of superposition possibles. That is the problem with the tensor product: the same state describes different superposition possible. I still have no idea of your MW interpretation of the singlet state. Each time you give it, it seems to refer to some collapse, or to chose a “typical" base. (Your patronising tone does not help) Bruno > That is not the case, because the usual "preferred basis problem" of the MWI > concerns the stability of any particular basis under environmental > decoherence. Here the basis is chosen according to the orientation of the > magnets -- there is no idea of preference under decoherence involved; the > only consideration is that the basis in the direction of the magnets is the > one in which you can most easily make verifiable predictions. You could work > in some other basis if you are so stupid, but that has no effect other than > to complicate you calculations. It would not affect the physics. > > 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 > <mailto:everything-list+unsubscr...@googlegroups.com>. > To post to this group, send email to everything-list@googlegroups.com > <mailto:everything-list@googlegroups.com>. > Visit this group at https://groups.google.com/group/everything-list > <https://groups.google.com/group/everything-list>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
