On 9/9/2025 3:53 AM, smitra wrote:
On 25-08-2025 20:40, Brent Meeker wrote:
On 8/25/2025 12:04 AM, smitra wrote:
But then one is defining "this universe" post hoc after the photon
lands on some point on the screen. One can do that, but this means
that there are two possibilities that really exist. Whether that's
considered to be in a single universe or two universes is just
semantics. There are two classes of paths for the photon, one class
is the set of paths through one slit, the other are the paths
through the other slit.
Given that's the case, we can then do another measurement where we
simply measure through which slit the photon goes. We then don't
bother to let the photon move through toward the screen anymore, we
just detect the outcome of measuring whether the photon after moving
past either slits ends up being detected immediately after the left
or the right slit.
If I then perform one such measurement, and I decide to go on
vacation destination X if the photon is detected behind the left
slit and I go to vacation destination Y if the result is the right
slit, and I end up going to X, the question is if there exists a
parallel world where I go to Y.
The question for people who would say that only one world where I go
to X exists, is then to explain why both possibilities for the
photon going to the left or right slit objectively exists when we
detect the photon only at the screen, but only one possibility
exists when we detect the photon directly after passing the slits.
The answer is, Don't confound possibility with reality.
Possibilities "objectively exist" doesn't mean the corresponding
realities exist. When you measure at one slit there is a different
reality than when measuring at the screen.
It's then not clear what physical mechanism would cause the two
realities to objectively exist
You mean the one in which you go to X and the other in which you go to
Y? There is no case in which two different realities exist. When you
put a detector at one slit you only detect half the photons. Of course
there is a different reality when you make a different measurement.
Brent
in some cases and not in other cases. So, they do exist when the
photons are not observed (even when doing the experiment with
molecules), but when we observe the photons then we say that the two
possibilities are merely possibilities and only one reality exists
when there is nothing in the experimental results that compels one to
make that assumption.
Saibal
Brent
Saibal
On 18-08-2025 21:56, Brent Meeker wrote:
Whatever goes thru the other slit to create the cancellation is
doing
it in the same universe; and incidentally it also increases the
incidence at other points. So I don't see that it implies a
parallel
universe.
Brent
On 8/17/2025 10:31 AM, smitra wrote:
See here:
https://www.youtube.com/watch?v=bux0SjaUCY0&t=885s [1]
Of course, you can never get to 100% rigorous proof in physics like
in mathematics. You can never rule out waking up tomorrow in some
alien world and aliens telling you that your life here on Earth was
a simulation and that everything you thought you knew about the laws
of physics is false.
The nice thing about the argument by Deutsch is that it doesn't
depend on QM being correct, it is based on interpreting the
interference experiment. So, QM could be wrong, or it could be that
some of the claims of the MWI proponents are wrong, and yet this
argument by Deutsch will still stand.
Saibal
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[1].
Links:
------
[1]
https://groups.google.com/d/msgid/everything-list/a1de5682-0789-4d6d-8794-28d553b68979%40gmail.com?utm_medium=email&utm_source=footer
[2]
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[3].
Links:
------
[1] https://www.youtube.com/watch?v=bux0SjaUCY0&t=885s
[2]
https://groups.google.com/d/msgid/everything-list/a1de5682-0789-4d6d-8794-28d553b68979%40gmail.com?utm_medium=email&utm_source=footer
[3]
https://groups.google.com/d/msgid/everything-list/8ad48823-1135-483b-90fe-b9249c3257c1%40gmail.com?utm_medium=email&utm_source=footer
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