> On 21 Jun 2018, at 08:02, Brent Meeker <[email protected]> wrote: > > > > On 6/20/2018 9:50 PM, Jason Resch wrote: >> >> >> On Tue, Jun 19, 2018 at 5:47 PM, Brent Meeker <[email protected] >> <mailto:[email protected]>> wrote: >> >> >> On 6/19/2018 8:16 AM, Bruno Marchal wrote: >> Most of these objections to CI are answered by decoherence theory. >> >> I have no clue how to interpret decoherence with a collapse theory. >> >> You use decoherence theory until you get to the reduced density matrix that >> is diagonal FAPP (or for all conscious purposes) and then you declare it is >> exactly diagonal and cut the other "worlds" loose. >> >> >> What's the point of that last step, when decoherence explains why we don't >> see those other branches? > > But decoherence didn't quite explain it. You have to take the trace over the > environment in order to justify making the reduced density matrix exactly > diagonal (instead of FAPP diagonal) and that step is not unitary evolution > per the SE, it's using a projection operator.
But the projection, with the MWI, is not due to a physical collapse, but just of a self-localisation procedure. It *is* the quantum version of the first person indeterminacy, that Everett called subjective probability. Bruno > > Brent > >> >> 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] >> <mailto:[email protected]>. >> To post to this group, send email to [email protected] >> <mailto:[email protected]>. >> Visit this group at https://groups.google.com/group/everything-list >> <https://groups.google.com/group/everything-list>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > > -- > 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 post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at https://groups.google.com/group/everything-list > <https://groups.google.com/group/everything-list>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- 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 https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
