On Wed, Dec 5, 2018 at 5:19 PM Philip Thrift <cloudver...@gmail.com> 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 <cloud...@gmail.com> 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 <cloud...@gmail.com> >>>> 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 <cloud...@gmail.com> >>>>>>> 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 -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
