On 8/25/2025 9:03 PM, Quentin Anciaux wrote:
Not all possibilities are realized, but those with non-zero amplitude
are realized somewhere in the superposition.
An article of faith among Everretians, with no empirical support. Have
you studied Barandes' MMI?
Brent
In MWI, "possibility" refers to branches with different measures, not
to mere logical abstractions. A "possible" event with zero measure is
equivalent to non-existence.
Quentin
All those moments will be lost in time, like tears in rain. (Roy
Batty/Rutger Hauer)
Le mar. 26 août 2025, 00:05, Brent Meeker <[email protected]> a
écrit :
Where did I use the word "never"?
Is it your contention that every possibility must be realized, in
which case "possibility" loses all meaning and might as well be
replaced by reality.
Brent
On 8/25/2025 1:34 PM, Quentin Anciaux wrote:
If you claim possibilities “objectively exist” but are never
realized, you’re redefining “existence” into something empty. An
"objective" possibility with no ontological counterpart is
indistinguishable from non-existence.
All those moments will be lost in time, like tears in rain. (Roy
Batty/Rutger Hauer)
Le lun. 25 août 2025, 21:50, Brent Meeker <[email protected]>
a écrit :
"Correspond" is a weak word. An expectation corresponds to
the thing expected. And the expectation is real. But it
doesn't follow that the thing expected is realized.
Possibility is not equivalent to reality.
Brent
On 8/25/2025 12:14 PM, Quentin Anciaux wrote:
Brent,
Saying that a possibility "objectively exists" but does not
correspond to any reality is paradoxical. Either it exists,
in which case it is part of reality, or it doesn’t, in which
case it’s not an objective possibility.
Quentin
All those moments will be lost in time, like tears in rain.
(Roy Batty/Rutger Hauer)
Le lun. 25 août 2025, 20:40, Brent Meeker
<[email protected]> a écrit :
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.
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
<https://www.youtube.com/watch?v=bux0SjaUCY0&t=885s>
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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