On 22-04-2018 00:21, [email protected] wrote:
On Saturday, April 21, 2018 at 9:07:37 PM UTC, smitra wrote:
On 21-04-2018 21:44, [email protected] wrote:
On Saturday, April 21, 2018 at 3:12:48 PM UTC-4, smitra wrote:
On 20-04-2018 02:44, Brent Meeker wrote:
On 4/19/2018 5:29 PM, smitra wrote:
One can a priori rule out any non-local effects using the fact
that
the dynamics as described by the Schrödinger equation is
local.
So, in
any theory where there is no collapse and everything follows
from
only
the Schrödinger equation, there cannot be non-local effects
The wave-function exists in configuration space so a point in it
already refers to multiple points in 3space.
Brent
Yes, but that doesn't yield any non-local effects.
Saibal
Why would you think it would, or should? Even the wf for the
singlet
system doesn't do that on its face. It's the Bell statistics that
establish non locality. AG
What the Bell statistics prove is that any hidden variable theory
that
would explain why in an experiment we obtain one result rather than
one
of the other possible results, would necessarily have to be a
non-local
theory. This means that if we reject non-local theories, we have to
reject any hidden variable theory.
While one considers the special case of entangled particles to get
this
result, the conclusion is, of course, valid in general: If there
were a
hidden variable theory underlying QM, it would have to fully
reproduce
QM and one can then show using the special case of entangled
particles
that the actual dynamics of the hidden variable theory must be
non-local.
But as long as we stay away from any hypothetical hidden variable
theory
(there isn't a shred of evidence for such theories) any non-locality
associated with such theories is totally irrelevant.
Saibal
I really don't understand your comments, which doesn't mean they're
wrong. I will try again. However, I do think that since collapse is
presumed to be instantaneous, it seems to imply non locality. Aren't
we assuming collapse in the analysis of the singlet state? If so, non
locality is baked in the pie, so to speak. AG
Yes, collapse does imply non-locality, but note that in the MWI there is
no collapse. There is no real "splitting of Worlds" in the MWI either,
it's only an effective splitting that can be interpreted as an effective
collapse as observed in the various effective worlds. In the MWI there
really exists only one world that's described by a universal
wavefunction that evolves according to the Schrödinger equation. There
is no non-locality at this fundamental level.
Saibal
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