On Sat, Jan 30, 2021 at 9:00 AM 'Brent Meeker' via Everything List < [email protected]> wrote:
> On 1/29/2021 5:52 AM, Bruno Marchal wrote: > > If you induce decoherence by measuring at the slits, then the interference > pattern disappears -- you have certainly created a separate "world" for > each path, but these can no longer interfere. That is part of the > definition of the "worlds" that are created by irreversible decoherence. > > > No problem. > > > So the concept of "world" is, indeed, well-defined in physics. > > > By giving a magic role to the observer, or its consciousness, or of > measurement. The observer can no more be a machine in that picture. > > > There's no magic or observer invoked. That's the function of decoherence, > which operates independent of observers or deliberate measurement. > Exactly. > It might not be defined in logic or metaphysics, but this is of no concern > to the working physicist -- we know perfectly well what we mean by "a > world”. > > FAPP. OK. > The goal here is to try to understand what happens. > > And we can readily tell when someone is talking nonsense by claiming that > "worlds interfere statistically without interacting”. > > > ? (That is rather standard, and pretty obvious, I would say). > > > Really? I've never heard of it and it seems pretty obviously nonsense to > me. > Yes. Bruno has a fine line in nonsensical sayings that he trots out on random occasions when he does not have a real argument. 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLRrefM3Nke%3D3mdbOCzZKYVd9SBq0GvfkSLd4Abn64tXbQ%40mail.gmail.com.
