Kevin Knuth has shown how to derive space-time structure and lorentz
invariance from ordered lattices of observers. I suspect that the UD can
be considered to 'run' on chains of observer events per Knuth picture. This
gives us a nice toy model of how space-time is emergent.


On Fri, May 10, 2013 at 1:18 PM, meekerdb <meeke...@verizon.net> wrote:

>  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's explained by
> Everett's MWI also, which is a kind of non-local hidden 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 over the
> environment to get a set of orthogonal subspaces that's a non-local,
> mathematical operation.
>
>
>  Local is about physical reality, not mathematical operation. The wave
> describing the physical (physicists included) evolves deterministically and
> locally. Non locality is in the (mathematical) appearances.
>
>
> In an EPR type experiment the wave-function's evolution is not local.  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), a local,
> computable, phenomenon, at the correct dimensions.
>
>
> ??  The state exists in Hilbert space, not space-time.  I depends on
> space-time variables which are space-like separate.  So even in a MWI
> picture the state is not local and the change in state due to a measurement
> interaction doesn't propagate in space-time.
>
>
>  Eventually to make this precise you need to marry GR and the quantum,
> and that's not easy.
>
>
> So will comp contribute to this?
>
> 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
>
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