On 10 May 2013, at 19:18, meekerdb wrote:

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On 5/10/2013 10:04 AM, Bruno Marchal wrote:On 10 May 2013, at 18:09, meekerdb wrote:On 5/10/2013 1:00 AM, Bruno Marchal wrote:On 09 May 2013, at 18:08, meekerdb wrote:On 5/9/2013 1:44 AM, Bruno Marchal wrote:I don't think that requires a wave function collapse, it'sexplained by Everett's MWI also, which is a kind of non-localhidden variable.Why non local? There is nothing non local in Everett's MWI.Sure it is. When you take the trace of the density matrix overthe environment to get a set of orthogonal subspaces that's anon-local, mathematical operation.Local is about physical reality, not mathematical operation. Thewave describing the physical (physicists included) evolvesdeterministically and locally. Non locality is in the(mathematical) appearances.In an EPR type experiment the wave-function's evolution is notlocal. It changes over a space-like interval.Only from the (first person plural) participators points of view,abstracting from the leaked information in the environment(s), alocal, computable, phenomenon, at the correct dimensions.?? The state exists in Hilbert space, not space-time. I depends onspace-time variables which are space-like separate. So even in aMWI picture the state is not local and the change in state due to ameasurement interaction doesn't propagate in space-time.

`There is no change in state due to a measurement, just local contagion`

`of superposition, and an observation which just inform us in which`

`partition of the multiverse we are. Of course a quantum sate is not`

`local, like a computation is not localized in the UD "in one place",`

`but in infinity of place. But there is no physical action at a`

`distance at all.`

Eventually to make this precise you need to marry GR and thequantum, and that's not easy.So will comp contribute to this?

`Comp, if correct, has no choice in the matter, given that it reduces`

`the whole of physics to intensional variants of machines' self-`

`reference.`

Bruno

Brent Perhaps you are dreaming about building a non abelian anyonic quantum computing machine through some fractional quantum Hall effect? This is less elementary. --- Bruno Marchal --You received this message because you are subscribed to the GoogleGroups "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 http://groups.google.com/group/everything-list?hl=en.For more options, visit https://groups.google.com/groups/opt_out.

http://iridia.ulb.ac.be/~marchal/ -- 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 http://groups.google.com/group/everything-list?hl=en. For more options, visit https://groups.google.com/groups/opt_out.