On 1/17/2021 10:00 PM, Pierz Newton-John wrote:
One needs to mention Frauchiger and Renner’s result here, which makes
rigorous the intuitive “Wigner’s friend” type argument and shows that
a single-world QM is inconsistent,
Does it? Seems to me F&R's experiment doesn't realize Wigner's friend.
The measure of the "friend" is not decohered into the environment and so
is reversible.
https://arxiv.org/pdf/2009.00983.pdf
Brent
given some very broad and sensible-sounding parameters, like “quantum
mechanics describes reality at all scales” and “no superdeterminism”.
It does away with Copenhagen as a respectable solution to QM
weirdness, and forces the question: if you don’t like MWI, what other
beloved notion are you prepared to sacrifice? Because whatever it is,
it ain’t gonna be pretty. I get the feeling AG would just like reality
to behave itself and be sensible. Frauchiger and Renner make it clear
it’s too late for that.
It’s interesting, incidentally, to read Max Born’s letters to Einstein
(Born was my great grandfather). It’s clear he still held a very
conservative view of what was going on and missed the point, all too
horrifyingly apparent to Einstein, that the implications of an
unaltered QM were extremely profound. For Einstein it smacked of an
irrational universe and he viscerally rejected that. Born, like Wile
E. Coyote, seemed to be sailing along unperturbed, oblivious to the
fact that the ground was no longer under his feet.
On Mon, 18 Jan 2021 at 3:43 pm, Alan Grayson <[email protected]
<mailto:[email protected]>> wrote:
On Sunday, January 17, 2021 at 11:04:26 AM UTC-7
[email protected] <mailto:[email protected]> wrote:
On Sun, Jan 17, 2021 at 9:41 AM Alan Grayson
<[email protected]> wrote:
/> One of the postulates of the MWI is that anything that
CAN happen, MUST happen./
Yes.
/> Are you denying that postulate?/
No
/> I am just applying it to a horse race. /
And if Many Worlds is correct then there is anAlan Graysonfor
every horse in that race, and there is an Alan Graysonwho saw
every one of those horses win. And if Many Worlds is not
correct then something even stranger must be. The one thing we
know for certain is that whatever quantum interpretation turns
out to be true it's going to be weird, very very weird.
Maybe no weirder than collapse of the wf. AG
/> Obviously, a horse race isn't a quantum process,/
You say it's obvious that you don't split because you'd feel
it if you did, and there were those that said obviously the
Earth doesn't move around the sun or move at all because we'd
feel it if it did.
John K Clark
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