> On 11 Nov 2019, at 10:58, Philip Thrift <[email protected]> wrote: > > > > On Monday, November 11, 2019 at 3:18:48 AM UTC-6, Bruno Marchal wrote: > >> On 10 Nov 2019, at 22:24, Bruce Kellett <[email protected] <javascript:>> >> wrote: >> >> On Sun, Nov 10, 2019 at 11:22 PM Bruno Marchal <[email protected] >> <javascript:>> wrote: >> On 7 Nov 2019, at 22:58, Bruce Kellett <[email protected] <javascript:>> >> wrote: >>> On Fri, Nov 8, 2019 at 8:53 AM 'Brent Meeker' via Everything List >>> <[email protected] <javascript:>> wrote: >>> ISTM that creates problem for defining a point where one of the >>> probabilities becomes actualized. MWI tries to avoid this by supposing >>> that all probabilities are "actualized" in the sense of becoming orthogonal >>> subspaces. There are some problems with this too, but I see the attraction. >>> >>> You can always find problems with any approach. What I particularly dislike >>> about MW advocates (like Sean Carroll) is that they are dishonest about the >>> number of assumptions they have to make to get the SWE to "fly". >>> Particularly over the preferred basis problem and Born rule. Zurek comes >>> closer, and he effectively dismisses the "other branches" as a convenient >>> fiction. If these other branches play no effective role in explaining our >>> experience, then why have them there? >> >> How could some terms in a wave expansion disappear without assuming some non >> unitary collapse of some sort? >> >> I did not say that they disappeared: merely that they do not play any role >> in explaining our experience. > > Then you agree with the, or some, form of the Many-Histories/World theory. > > > >> If you can point to any such role, then fine. But I doubt that you can do >> this. > > That is the whole point of realism. To believe in things despite we can not > access to them. The belief that reality is bigger than the reality we can > personally observe. > > > >> >> There is no preferred basis, only personal basis to be able to interact >> locally in between us. >> >> Again you appear to ignore the primary role of science is in explaining our >> experience. In our experience, there most certainly is a preferred basis -- >> the world around us has not dissolved into the "mush" that Schroedinger >> feared so much. If there is only a "personal basis", explain to me why your >> personal basis does not include superpositions of live and dead cats. > > > For exactly the same reason that when I am duplicated in Washington and > Moscow, I don’t feel personally to be in both cities at once. > > The linearity of the evolution of the wave + the linearity of the tensor > product entails that if a robot observe a cat in the state a + d, and this > with a ad-measuring device, he ends up into a robot observing the evolution > of a cat which is alive, and a robot observing the evolution of a cat which > is dead. > > Once we have a body, evolution has chosen the “preferred base”, but it does > not play a fundamental role in the fundamental equation. We need some base to > have a perspective, like in Mechanist philosophy of mind we need some > universal machinery to be able to talk on all of them. > > Bruno > > > > > If reality is pure "information" (as a lot of physicists today seem to > believe, and that belief is required for Many Worlds), than copying > (branching) is free.
But many physicists who claim that there is only information usually think about quantum information, and they takes this (physical) notion for granted. It is still a form of materialism, as it assumes some quantum formalism, instead of deriving it from arithmetic (or from any universal machinery) as it should. > > But if all is matter, then there cannot be Many Worlds - or Many "You”s. I don’t know what is matter, nor what is a “world”. That is why I work on this. Bruno > > @philipthrift > > -- > 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/e8e2b325-14e7-48c3-a60a-8d2bd5e53cec%40googlegroups.com > > <https://groups.google.com/d/msgid/everything-list/e8e2b325-14e7-48c3-a60a-8d2bd5e53cec%40googlegroups.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/86F82019-8AFB-4665-AC0F-D9B3E0F2D08B%40ulb.ac.be.
