Not all possibilities are realized, but those with non-zero amplitude are realized somewhere in the superposition. 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 >>> >>> 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 >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Everything List" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion visit >>> >>> https://groups.google.com/d/msgid/everything-list/a1de5682-0789-4d6d-8794-28d553b68979%40gmail.com >>> [1]. >>> >>> >>> Links: >>> ------ >>> [1] >>> >>> https://groups.google.com/d/msgid/everything-list/a1de5682-0789-4d6d-8794-28d553b68979%40gmail.com?utm_medium=email&utm_source=footer >>> >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Everything List" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion visit >>> https://groups.google.com/d/msgid/everything-list/8ad48823-1135-483b-90fe-b9249c3257c1%40gmail.com >>> <https://groups.google.com/d/msgid/everything-list/8ad48823-1135-483b-90fe-b9249c3257c1%40gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Everything List" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion visit >> https://groups.google.com/d/msgid/everything-list/CAMW2kArVxEco-aY%3D0xw1ktADavpJvwbhaXMgNrXUFBupQJCxyA%40mail.gmail.com >> <https://groups.google.com/d/msgid/everything-list/CAMW2kArVxEco-aY%3D0xw1ktADavpJvwbhaXMgNrXUFBupQJCxyA%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Everything List" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion visit >> https://groups.google.com/d/msgid/everything-list/09f1e290-9a15-4e11-adc7-3fb43fe7bbbe%40gmail.com >> <https://groups.google.com/d/msgid/everything-list/09f1e290-9a15-4e11-adc7-3fb43fe7bbbe%40gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/everything-list/CAMW2kAq%3DoUbNSGZ3B7T945GGNv-Vovajc40kj8QC%3D7d5%2BgTHfg%40mail.gmail.com > <https://groups.google.com/d/msgid/everything-list/CAMW2kAq%3DoUbNSGZ3B7T945GGNv-Vovajc40kj8QC%3D7d5%2BgTHfg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/everything-list/bea0de9d-e989-4da5-b152-5d7df5be11ba%40gmail.com > <https://groups.google.com/d/msgid/everything-list/bea0de9d-e989-4da5-b152-5d7df5be11ba%40gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Everything List" group. 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