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.
Saibal
Brent
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