On Wednesday, December 5, 2018 at 12:28:19 AM UTC-6, Bruce wrote: > > On Wed, Dec 5, 2018 at 5:19 PM Philip Thrift <[email protected] > <javascript:>> wrote: > >> 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]> 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*. >> > > Inconsistent histories? > > >> (Did you watch the lecture by Fay Dowker?) >> > > No, I don't watch utube videos. > > 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. >> > > Your arxiv references do not support your case. Reverse causation, as it > seems to be required in your account, is simply a nonsense. Huw Price lost > the plot a long time ago. > > There is no competition between the different paths between the initial > and final state -- which is what is used to calculate probabilities in the > path integral approach. So there is no Darwinian (or other) selection of > one such path over others. Quantum Darwinism is about something quite > different. Even Wikipedia agrees! Read Zurek's papers on this. > > Bruce >
OK. As Kay Dowker stated in her presentation: The path integral interpretation is still under development. My (retrocausal) version of Darwinian selection w.r.t. multiple histories <https://en.wikipedia.org/wiki/Multiple_histories> *is* *the next development.* - 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.
