> On 29 Jan 2021, at 23:00, '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.
In the “Many-Histories”? Then I am OK. It is magic if one histories is made “more real” than another one. Bruno > >> >> >> >> >>> 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. > > Brent > >> >> > > > -- > 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/29115ce1-a0f5-b491-7e6d-f53f42f447e9%40verizon.net > > <https://groups.google.com/d/msgid/everything-list/29115ce1-a0f5-b491-7e6d-f53f42f447e9%40verizon.net?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/F184F71D-62C6-4D06-975E-CC2B9BE73A17%40ulb.ac.be.
