> On 15 Aug 2019, at 02:54, Bruce Kellett <bhkellet...@gmail.com> wrote: > > On Wed, Aug 14, 2019 at 10:10 PM Bruno Marchal <marc...@ulb.ac.be > <mailto:marc...@ulb.ac.be>> wrote: > On 12 Aug 2019, at 14:42, Bruce Kellett <bhkellet...@gmail.com > <mailto:bhkellet...@gmail.com>> wrote: >> >> That is simply incorrect. I refer you again to Zurek, who works in a >> basically Everettian framework, but he stresses the importance of >> environmental induced superselection (einselection) in producing the >> preferred pointer basis. This then breaks things, in the sense that no other >> basis is stable against decoherence, and other sets of basis vectors rapidly >> (in times of the order of femtoseconds) collapse on to the preferred pointer >> states. This is the basis of the emergence of the classical world from the >> quantum substrate. And this occurs in Everett's relative state approach just >> as much as in a Copenhagen-like collapse models. > > That explains why the many histories will look classical. But if I observe a > cat in the dead+alive state, > > The point of the existence of a preferred basis is that you will never > observe a cat in a "dead+alive" state.
If that is what you mean, we both agree that Everett + Zurek solves that problem. But the point is that If I observe the cat with an apparatus deciding between alive and dead, I will put myself in the corresponding superposition, unless some physical collapse occurs, but then we are no more in Everett’s QM (QM without collapse). 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 > <mailto:everything-list+unsubscr...@googlegroups.com>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/CAFxXSLSN0pG4NkqVigRrmDDjSqbwg_f%3DSxfUG%3D%2BRaKCLTPc0rQ%40mail.gmail.com > > <https://groups.google.com/d/msgid/everything-list/CAFxXSLSN0pG4NkqVigRrmDDjSqbwg_f%3DSxfUG%3D%2BRaKCLTPc0rQ%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/A5400B9A-7AA7-474A-A681-767277CA57FF%40ulb.ac.be.
