On Wednesday, December 5, 2018 at 12:00:18 AM UTC-6, Bruce wrote: > > On Wed, Dec 5, 2018 at 4:51 PM Philip Thrift <[email protected] > <javascript:>> wrote: > >> On Tuesday, December 4, 2018 at 11:39:43 PM UTC-6, Bruce wrote: >>> >>> On Wed, Dec 5, 2018 at 3:53 PM Philip Thrift <[email protected]> wrote: >>> >>>> On Tuesday, December 4, 2018 at 10:28:39 PM UTC-6, Philip Thrift wrote: >>>>> >>>>> On Tuesday, December 4, 2018 at 3:45:32 PM UTC-6, Bruce wrote: >>>>>> >>>>>> On Wed, Dec 5, 2018 at 6:58 AM Philip Thrift <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> >>>>>>> On Tuesday, December 4, 2018 at 1:53:15 PM UTC-6, Brent wrote: >>>>>>>> >>>>>>>> >>>>>>>> On 12/4/2018 12:25 AM, Philip Thrift wrote: >>>>>>>> >>>>>>>> >>>>>>>> 1. Histories originate at an emitter e and end at screen locations >>>>>>>> s on a screen S. >>>>>>>> 2. At each s there is a history bundle histories(s). A weight w(s) >>>>>>>> is computed from the bundle by summing the unit complex numbers of the >>>>>>>> histories and taking the modulus. >>>>>>>> 3. The weight w(s) is sent back in time over a single history h*(s) >>>>>>>> selected at random (uniformly) from histories(s). >>>>>>>> 4. At e, the weights w(s) on backchannel of h*(s) are received (in >>>>>>>> the "present" time) >>>>>>>> 5. A single history h*(s*) is then selected from the distribution >>>>>>>> in 4. >>>>>>>> >>>>>>>> >>>>>>>> How is it selected? Above you said "at random". But that implies >>>>>>>> there is already a probability measure defined on the histories. How >>>>>>>> is >>>>>>>> this probability measure determined? Or put another way how do you >>>>>>>> determine what histories to consider to form the bundles in step 2? >>>>>>>> >>>>>>>> Brent >>>>>>>> >>>>>>> >>>>>>> Selection happens via quantum Darwinism. >>>>>>> >>>>>> >>>>>> >>>>>> Do you have even the faintest understanding of Quantum Darwinism? >>>>>> >>>>>> Bruce >>>>>> >>>>> >>>>> How is *sum over histories with Darwinian selection* (as defined) >>>>> not quantum Darwinism? >>>>> >>>>> Operationally, what is different? >>>>> >>>>> - pt >>>>> >>>> >>>> *Sum over histories with Darwinian selection* is consistent with *Quantum >>>> Darwinism as a Darwinian process* [ https://arxiv.org/abs/1001.0745 ]. >>>> >>> >>> No, you clearly don't understand Quantum Darwinism! Zurek's Darwinism is >>> selection of pointer states, not one history from a bundle. >>> >>> Bruce >>> >> >> >> Histories are (hidden) states. >> > > It becomes obvious that you don't really understand consistent histories, > either. > > Bruce >
I've never once mentioned *consistent histories*, only *sum over histories*. (Did you watch the lecture by Fay Dowker?) Pointer states [ https://arxiv.org/abs/1508.04101 ] can best be understood as related to histories via the *Reflective Path Integral* interpretation of the EPR experiment. - pt -- 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.
