On Thu, Feb 26, 2015 at 9:20 PM, Bruce Kellett <[email protected]> wrote:
> Jason Resch wrote: > >> On Thu, Feb 26, 2015 at 3:01 PM, meekerdb <[email protected] <mailto: >> [email protected]>> wrote: >> >>> >>> MWI predicts the same as QM+collapse. >>> >> >> Only because it assumes the Born rule applies to give a probability >> interpretation to the density matrix. But Everettista's either >> ignore the need for the Born rule or they suppose it can be derived >> from the SWE (although all attempts have fallen short). >> >> So it seems MW is at worst case they are on equal footing as all other >> interpretations similarly assume the Born rule without explaining it, and >> at best MW is superior in that it possibly explains the Born rule. >> > > A series of failed attempts to derive the Born rule from within the > Everettian program does not amount to evidence that "it possibly explains" > it. > > > >> But it assumes the Born rule provides the relative measure - which >> is more than just the SWE. You can solve the problem of branch >> counting by assuming infinitely many parallel worlds - but then that >> raises the problem of defining "probability". >> >> There's no problem defining probability. There is, however, a big problem >> defining collapse. >> > > Collapse is easily defined. So at what point does it happen? What triggers it? On what scales can and can't it happen? How do you define a measurement? An observer? How is a measuring apparatus or an observer different from any other physical object? What is the special property of the observer / measuring device that enables it to collapse the wave function? If you have an observer who himself is isolated from an external environment, can he collapse the wave function? Or can only you collapse him by observing him? > No one has yet given an adequate account of probability within the > Everettian program. Branch counting is known not to work, but neither does > anything else! > I guess we tried everything! My mistake. > > > >> QM stands on firmer ground that GR. And is GR non-linear? >> > > Yes. > Thanks. Jason -- 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 http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
