Le mar. 18 févr. 2025, 00:32, Bruce Kellett <[email protected]> a écrit :
> On Tue, Feb 18, 2025 at 10:13 AM Quentin Anciaux <[email protected]> > wrote: > >> >> >> Le mar. 18 févr. 2025, 00:05, Bruce Kellett <[email protected]> a >> écrit : >> >>> On Tue, Feb 18, 2025 at 9:51 AM Quentin Anciaux <[email protected]> >>> wrote: >>> >>>> >>>> If you assign probability to horse X winning, you are describing >>>> uncertainty before the race is run, which is exactly the point. In standard >>>> probability, that uncertainty is about a single outcome being realized. In >>>> MWI, it’s about which branch an observer will find themselves in. >>>> >>> >>> And how many branches is that? It is just about a single outcome being >>> realized. Other possibilities are not realized. Same as with probability -- >>> One thing happens, others don't. >>> >> >> In a single-history universe, unrealized possibilities are nothing more >> than fiction, they never happen, never will, and have no causal impact on >> reality. Why invoke entities that don’t exist and never will to explain the >> one outcome that does? That’s not an explanation, it’s just storytelling. >> >> >>> The key question isn’t whether probability exists before measurement, >>>> it’s why the observer should expect the Born rule to govern the >>>> distribution of experiences. If you dismiss self-locating uncertainty, then >>>> what mechanism in a purely unitary framework explains why we don’t see >>>> uniform distributions or some other weighting instead of Born’s rule? >>>> >>> >>> Why do you expect to see outcomes conforming to the Born probabilities? >>> >> >> Because experiments consistently confirm the Born probabilities. The >> question isn’t whether they hold, it’s why they hold in a purely unitary >> framework. In a single-world view, you assume the Born rule as a >> fundamental postulate. In MWI, it should emerge naturally, but without a >> clear derivation, it remains an open problem >> >> >>> In a single-world framework, the supposed ensemble of possible outcomes >>>> is purely imaginary, it never happens, it never will, and it has no more >>>> reality than a work of fiction. Treating these unrealized possibilities as >>>> if they have explanatory power is just storytelling, not a real mechanism. >>>> >>> >>> You are obsessed with 'mechanisms'. This is quantum mechanics, not 19th >>> century rods-and-wires stuff. What is the "mechanism" of gravity? With >>> Newton we can reasonably say *Hypotheses non fingo!* >>> >> >> Physics has always sought deeper explanations beyond just stating “this >> is how things happen.” Newton could say hypotheses non fingo because his >> equations worked without additional assumptions. But if unitary evolution >> is all there is, why should probability emerge at all, and why should it >> follow Born’s rule? Dismissing this as an unnecessary question is just >> assuming what needs to be explained. >> > > Anyone who has experience of dealing with small children, knows that there > can always be an endless sequence of "why?" questions. The trouble is that > such sequences always end up with something like "why am I who I am and not > someone else?" Some questions simply have no answers. > > As I have pointed out, MWI is inconsistent with the Born rule, so looking > for an explanation of the Born rule in MWI is rather silly. > You did not, you're just assuming what you want to prove. Quentin > 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 visit > https://groups.google.com/d/msgid/everything-list/CAFxXSLR-_42Fg%2B9BWfr%2BoR9qwkOYN8v%2B1LMNCxOak5FXPMsdcg%40mail.gmail.com > <https://groups.google.com/d/msgid/everything-list/CAFxXSLR-_42Fg%2B9BWfr%2BoR9qwkOYN8v%2B1LMNCxOak5FXPMsdcg%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 visit https://groups.google.com/d/msgid/everything-list/CAMW2kArMKKnr9BB8oc00bG3QjRaA10fUErOkd%3D4iodnBH-eYLA%40mail.gmail.com.
