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. Eventually
to make this precise you need to marry GR and the quantum, and that's
not easy.
Bruno
Brent
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