On 04 Feb 2014, at 18:19, meekerdb wrote:
On 2/4/2014 2:25 AM, Bruno Marchal wrote:
The MWI is deterministic, however, and hence has hidden variables.
But not "hidden variable" in the EPR sense. In the MWI, there are
hidden universes, they are not variable, but terms in the universal
wave, and we just don't know which terms apply to us. If it was
hidden variable in the EPR sense, then by Bell, they would be non-
local, and you would conclude falsely (like Clark) that the MWI has
to be non local (which I doubt very much)
But is it non-local? The FPI is based on find yourself in a
particular universe (where the measurement was "up" say) so that's
an indicial variable labeling that universe.
Yes, but in EPR, the particles did interact, and their entanglement
means that in each partition of the multiverse they inherit of the
opposite spin. So when Alice makes a measurement, she only select the
relevant partition, without making any action at a distance.
When you do the math, you see that no non-locality appears in any term
of the wave.
Now you may say that indicial label really only applies to the
forward lightcone relative to the measurement. But if is one of an
EPR pair, it must also carry a variable value that tells it it is
correlated with the the other particle of the EPR pair, so that in
the overlap of their forward lightcones the statistis will violate
Bell's inequality.
Assuming some collapse, or unicity of outcome.
Otherwise you could get the same statistics using non-entangled
pairs at the two measuring devices.
I don't think so. The two particles did interact and then where
separated at light speed. Then the measurement, without collapse,
determine the common partitions shared by Alice and Bob.
That is why Alice can quantum-teleport a photon by doing a
measurement, and then sending by classical means the outcome to Bob,
which then know which corresponding measurement it has to do to
retrieve Alice's photon state.
I am rather confident that the MWI restores Einstein's locality, as
well as the physical 3p-determinacy.
(and this without using the symmetry of time and *special
conspiratorial boundaries conditions*).
Bruno
Brent
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