> On 15 Aug 2019, at 02:54, Bruce Kellett <[email protected]> wrote: > > On Wed, Aug 14, 2019 at 10:10 PM Bruno Marchal <[email protected] > <mailto:[email protected]>> wrote: > On 12 Aug 2019, at 14:42, Bruce Kellett <[email protected] > <mailto:[email protected]>> 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 [email protected] > <mailto:[email protected]>. > 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/A5400B9A-7AA7-474A-A681-767277CA57FF%40ulb.ac.be.
