On 15 Nov 2017, at 00:55, Bruce Kellett wrote:
On 15/11/2017 12:47 am, Stathis Papaioannou wrote:
On Mon, 13 Nov 2017 at 8:54 am, Bruce Kellett <[email protected]
> wrote:
I don't think you have fully understood the scenario I have outlined.
There is no collapse, many worlds is assumed throughout. Alice splits
according to her measurement result. Both copies of Alice go to meet
Bob, carrying the other particle of the original pair. Since they
both
have now met Bob, the split that Alice occasioned has now spread to
entangle Bob as well as the rest of her environment. So there are now
two worlds, each of which has a copy of Bob, and an Alice, who has a
particular result. Locality says that Bob's particle is unchanged
from
production, so when he measure its spin, he splits into two copies,
according to spin up or spin down. Since Alice is standing beside
him,
she also becomes entangled with his result. But Alice already has a
definite result in each branch, so we now have four branches: with
results 'up-up', 'up-down', 'down-up', and 'down-down'. However, only
the 'up-down' and 'down-up' branches conserve angular momentum. How
do
you rule out the other branches?
When you put something in the cupboard and come back later to get
it, why, under MWI, is it still there?
I don't understand the significance of your question. Why wouldn't
things remain stable in MWI? After all, the whole world, as it is,
becomes entangled with the particular branching event.
OK, but not instantaneously. This might be the point where we disagree
in the interpretation of the Non-collapse theory.
Bruno
Bruce
--
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.
