On 27 Nov 2017, at 01:55, John Clark wrote:
On Sun, Nov 26, 2017 at 6:36 PM, <[email protected]> wrote:
> Feynman, who wasn't an MWI enthusiast [...]
"Political scientist" L David Raub reports a poll of 72 of the
"leading cosmologists and other quantum field theorists" about the
"Many-Worlds Interpretation" [...] Amongst the "Yes, I think MWI
is true" crowd listed are Stephen Hawking and Nobel Laureates Murray
Gell-Mann and Richard Feynman. Gell-Mann and Hawking recorded
reservations with the name "many-worlds", but not with the theory's
content. Nobel Laureate Steven Weinberg is also mentioned as a many-
worlder"
https://www.hedweb.com/everett/everett.htm#believes
This link does not work anymore, but recently Jason gave
http://www.anthropic-principle.com/preprints/manyworlds.html
But to be fair, Feynman wasn't exactly a enthusiast, I think he
believed Many Worlds was the the least bad quantum interpretation
but he wasn't really a fan of philosophy and had sympathy for the
"shut up and calculate" quantum interpretation.
You are right. Feynman does not hide the philosophical difficulties,
but still wrote in his "The nature of Light" popular book, if I
remember well, that the collapse is a collective hallucination.
Bruno
> no human observer is necessary to perform a quantum
experiment.
Hey you don't have to convince me that an observer is not
needed for something to exist in one definite state, but then I'm
not a fan of Copenhagen.
> If the detector is designed for a which-way measurement, the
interference is destroyed.
If the which way information is retained the interference pattern
is destroyed, if the information is destroyed then you have
interference, and that is what Many Worlds predicts.
>> The very heart the Copenhagen interpretation is that things
do not have definite properties before they are measured,
> Wrong.
"According to the Copenhagen interpretation, physical systems
generally do not have definite properties prior to being measured
"
https://en.wikipedia.org/wiki/Copenhagen_interpretation
> Your claim only applies in a special situation of quantum
experiments which manifest interference effects.
I agree, interference effects only manifest in special
circumstances, when a world splits become different and then the two
evolve in such a way that the two become identical again and so
merge back together, and that is only likely to happen if the
difference between the two worlds is very small; that's why we don't
see weird quantum stuff in our macro world, like in the Earth Moon
system.
John K Clark
--
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 post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/everything-list.
For more options, visit https://groups.google.com/d/optout.
http://iridia.ulb.ac.be/~marchal/
--
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 post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/everything-list.
For more options, visit https://groups.google.com/d/optout.
