On 11-07-2021 00:59, Bruce Kellett wrote:
On Sun, Jul 11, 2021 at 8:27 AM smitra <[email protected]> wrote:
On 10-07-2021 21:41, 'Brent Meeker' via Everything List wrote:
On 7/10/2021 1:19 AM, Bruno Marchal wrote:
So, in general we can conclude by generalizing this to any large
number of particles that even with what we consider to be
permanent
records, you don't get rid of the theoretical possibility of
interference between the sectors where those records are
different.
We can if the universe is expanding faster than light beyond the
Hubble
radius.
The expansion of the universe is irrelevant. The information needed
to
see the interference pattern continues to exist outside the horizon
when
it isn't accessible to us anymore. And this is irrelevant for the
discussions about observations in quantum mechanics. If an observer
performs a measurement and the claim is that this is a unitary
process
with the observer evolving into a superposition, while the objection
against this claim is that infrared photons are escaping and will
eventually move beyond the Hubble volume, then these photons will
still
not have escaped beyond the Hubble horizon by the time the observer
is
aware of the results of the experiment. So, whether or not the
photons
will eventually no longer be accessible, cannot be relevant.
Once the photons escape from the immediate environs of the experiment,
they are not recoverable. Try shining a torch at night to illuminate a
tree. Now try to stop the illumination already present. You can stop
future illumination by covering the torch, or switching it off. But
once the tree is illuminated it is not reversible. The expansion of
the universe, and the existence of the Hubble horizon, just makes the
irreversibility more obvious.
This is only true in practice, not in principle because the escaping
photons be captured and detected in principle. It's also irrelevant,
because the photons that escape continue to exist, the information
contained in the photons continues to exist, even if it were true that
they could not be recovered. Then if we were to conduct an interference
experiment with the balls then we wouldn't see an interference pattern.
But if we write down where each balls lands on the screen then this
information together with information that could be obtained by
performing certain measurements on the escaping photons emitted by each
ball would still yield an interference pattern.
Bruce
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