On 4/21/2018 4:41 PM, smitra wrote:
On 22-04-2018 00:18, Brent Meeker wrote:
On 4/21/2018 12:42 PM, smitra wrote:
On 20-04-2018 04:54, Brent Meeker wrote:
On 4/19/2018 7:28 PM, [email protected] wrote:
On Friday, April 20, 2018 at 2:13:20 AM UTC, Brent wrote:
On 4/19/2018 6:39 PM, [email protected] wrote:
On Friday, April 20, 2018 at 12:44:04 AM UTC, Brent 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
I've met WF's with variables of space and time. They don't have
multiple
points in 3 space. Please elaborate as to your meaning. AG
The wave function for two particles is a function of six spacial
coordinates.
Brent
OK, simple, but how is this responsive to smitra's comment? AG
So a measurement on one can, assuming some conserved quantity
entangling them, will have an effect on the other, even if the all the
details of measurement and decoherence are included and the
measurement is treated as Everett does. It still zeroes out cross
terms in the density matrix that correspond ot violation of the
conservation law and that entails changing the wave function at remote
places.
Brent
That's then an artifact of invoking an effective collapse of the
wavefunction due to introducing the observer. The correlated two
particle state is either put in by hand or one has shown how it was
created. In the former case one is introducing non-local effects in
an ad-hoc way in a theory that only has local interactions, so there
is then nothing to explain in that case. In the latter case, the
entangled state itself results from the local dynamics, one can put
ALice and Bob at far away locations there and wait until the two
particles arrive at their locations. The way the state vectors of
the entire system that now also includes the state vectors of Alice
and Bob themselves evolve, has no nontrivial non-local effects in
them at all.
Sure it does. The state vector itself is a function of spacelike
separate events, which cause it to evolve into orthogonal
components...whose statistics violated Bell's inequality.
Brent
There is no non-locality implied here unless you assume that the
dynamics as predicted by QM is the result of a local hidden variables
theory.
It's non-local because the wave-function value at event x changes dues
event y even though x and y are spacelike.
Brent
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