Brent, The Born rule is not something that "should" be obeyed—it is obeyed in experiments. The question is why. Saying "some things happen and others don’t" doesn’t answer that. If amplitudes determine the behavior of quantum systems in every other context, why would they suddenly become meaningless when it comes to observer experiences? That’s what you need to justify.
You claim that talking about observers is "obfuscation," but probability itself is about expectations—what an observer should expect to see given the structure of the theory. If multiple observers look at the same SG detector, yes, they all see UP. But why was that outcome observed with probability a² rather than any other distribution? Ignoring that question doesn’t make it go away. The challenge for any interpretation—whether MWI, collapse, or anything else—is to explain why experiments follow the Born rule. Dismissing the problem as circular without engaging with why amplitudes might determine observer frequencies is avoiding the issue, not resolving it. Quentin Le ven. 21 févr. 2025, 22:25, Brent Meeker <meekerbr...@gmail.com> a écrit : > > > On 2/20/2025 11:29 PM, Quentin Anciaux wrote: > > Bruce, > > The claim follows from basic probability reasoning applied to MWI. > Decoherence ensures that branches evolve independently, preventing > interference. This means that observer instances in different branches > cannot interact. If you accept that observer experiences are determined by > where they find themselves in the wavefunction, then the relative frequency > of experiences should follow the distribution of amplitudes squared. > > "Should" why? So that the Born rule will be obeyed, which is why your > argument is circular. And you keep talking about observers and their > experience. This is just obfuscation. Once an electron spin is measured > UP arbitrarily many observers can look at the SG detector film and > experience seeing it up. That has nothing to do with the Born rule. > > 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 everything-list+unsubscr...@googlegroups.com. > To view this discussion visit > https://groups.google.com/d/msgid/everything-list/c92aca4c-7a46-4286-8337-2fa5faf093e4%40gmail.com > <https://groups.google.com/d/msgid/everything-list/c92aca4c-7a46-4286-8337-2fa5faf093e4%40gmail.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 everything-list+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAMW2kArSe7DDBx3Bub-7QPg69vK5340-PCcPwdVfSVeKZjBNWA%40mail.gmail.com.
