Talk:Many-worlds interpretation

message: The current article makes this claim in the caption for a figure:
A map from Robert Sobel's novel For Want of a Nail, an artistic illustration of how the butterfly effect – in this example the branching or point of divergence from our timeline's history is in October 1777 – can profoundly alter the course of history.
The connection between this classical effect in nonlinear systems and the branching in the many-worlds interpretation of quantum mechanics is not referenced. 
Here is a contrary reference: “The Quantum Butterfly Noneffect” in SA Space & Physics Vol. 3 No. 6 (December 2020) "A familiar concept from chaos theory turns out to work differently in the quantum world."
Now there may be scientific work showing that MWI's model matches the butterfly effect, in which case both points of view could be represented. To me such a presentation of opposing points of view belong in quantum chaos or butterfly effect. Johnjbarton (talk) 03:47, 1 December 2023 (UTC)
replies: text: Irrelevant to the effect on macroscopic, non-linear history.  As they say, "To what extent the no-butterfly effect might apply in the macroscopic world of our lives is an open question,"  cheers, Michael C. Price talk 04:07, 1 December 2023 (UTC)
replies: text: Ok let's check your reference. Oh, you don't have one. So we have no idea if there is any connection between the butterfly effect and MWI other than your personal assertion. Johnjbarton (talk) 16:46, 1 December 2023 (UTC)
replies: text: I've re-removed the picture and caption; more explanation in the "Literature and alternate histories" section above. Crossroads -talk- 01:39, 18 February 2024 (UTC)
thread_title:  The butterfly effect claim is [[WP:OR]] 

message: The "Equivocal" section begins with Ladyman and Ross weighing the pros and cons of MWI. This makes sense as an example of "equivocal". But the Feynman paragraph is not similar. It has two references. One is a pseudo-science book that cites an unpublished poll supposedly by a political scientist, L David Rabi. (The poll reports Gell-Mann as giving the same answer as Feynman, but Gell-Mann is not a Yes.) Two is an offhand remark by Feynman commenting on someone else's interest. The section quoted starts out:  "In fact the physicists have no good point of view. Somebody mumbled something about a many-world picture, and that many-world picture says that the wave function ~ is what's real, ... It's possible, but I'm not very happy with it. So, I would like to see if there's some other way out,..." Does that sound like "yes" or even weighing the idea pro/con?
Richard Feynman publish many books on QM and discussed QM in many public lectures: he had plenty of opportunity to discuss MWI but did not. James Gleick never mentions Everett or MWI in "Genius: The Life and Science of Richard Feynman." Gleick mentions that Feynman rarely read other peoples work. Feynman was passionately interested in his own views of quantum mechanics. Rather than equivocal Feynman was disinterested. Johnjbarton (talk) 16:52, 3 December 2023 (UTC)
replies: text: Feynman also at least once rejected the notion of 'universal wavefunction' when Wheeler brought up the Everett interpretation up in the 1957 Chapel Hill conference. (Chapel Hill report, p.270) But since it is just a single remark, I wouldn't use this to put him into the 'Rejection' bin either. I agree that we do not need to invoke Feynman here if he did not write anything about this topic. Jähmefyysikko (talk) 17:27, 3 December 2023 (UTC)
thread_title:  Feynman: equivocal or disinterested?