> On 14 Aug 2018, at 04:01, Stathis Papaioannou <[email protected]> wrote: > > > > On Tue, 14 Aug 2018 at 06:58, <[email protected] > <mailto:[email protected]>> wrote: > > > On Monday, August 13, 2018 at 2:27:55 PM UTC, Jason wrote: > > > On Mon, Aug 13, 2018 at 12:05 AM Bruce Kellett <[email protected] <>> > wrote: > From: Jason Resch <[email protected] <>> >> >> On Sun, Aug 12, 2018 at 5:06 AM Bruno Marchal <[email protected] <>> wrote: >> >>> On 11 Aug 2018, at 02:29, Bruce Kellett <[email protected] <>> wrote: >>> >>> They do not "belong to different branches" because they do not exist, and >>> have never existed. This notion seems to be important to your idea, and I >>> can assure you that you are wrong about this. >> >> How could that be possible? You suppress the infinities of Alice and Bob >> only because you know in advance what is the direction in which Alice will >> make her measurement. What if she changes her mind? >> >> >> Right. >> >> I would like Bruce to consider the case Alice measures alternately x and z >> spin axes of an electron 1000 times and interprets those measurement results >> as binary digits following a decimal point to define the real number to >> which she will set her measurement angle to (before she measures her >> entangled particle). >> >> Certainly in the no-collapse case there would be at least 2^1000 Alices who >> perform the measurement at each of the possible measurement angles that can >> be defined by 1000 binary digits. What I wonder is how many Alices Bruce >> would believe to exist in this scenario before she measures her entangled >> particle. > > How do 2^1000 copies of Alice make any difference? Each measures the > entangled particles only once. Besides, This is not what is done. I see > little point in making up alternative scenarios -- why not explain the > straightforward original scenario? Imaginary copies are beside the point. > > If you cannot focus your attention on the original scenario, I see little > point in your trying to do physics. > > I bring this question up because you repeatedly refer to only "one Alice" > before the measurement, and also say that Alice and Bob are "in one and the > same branch" prior to measurement. But normal QM without collapse would say > Alice and Bob are branching all the time, even before they measure their > entangled pair. > > > They're branching all the time prior to measurement, that is without > collapse? Pretty fantastic. Where, how, is this affirmed by QM? AG > > Collapse is not part of the formalism of QM,
I wish tis to be true, but in most textbook, the collapse is still presented as a postulate, part of the theory. I call that theory “Copenhagen QM”. I call the theory without the collapse: Everett QM, or simply QM-without the collapse axiom. Both theories have their interpretation problem, and the collapse theory is basically the assertion that the observers do not obey to quantum mechanics (dualist theory). > so "branching all the time" is what it affirms. That is the whole point of > no-collapse interpretations. Yes. Without collapse, we all “split” when we measure polarized light coming from a distant galaxy. The differentiation/splitting is a subliminal phenomenon, unlike many popular accounts of Everett claim. Bruno > > > -- > Stathis Papaioannou > > -- > 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 post to this group, send email to [email protected] > <mailto:[email protected]>. > 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
