On 6/19/2018 7:25 AM, Bruno Marchal wrote:
On 16 Jun 2018, at 22:41, Brent Meeker <[email protected]
<mailto:[email protected]>> wrote:
On 6/16/2018 10:16 AM, John Clark wrote:
>
/Another universe comes into existence when Joe the Plumber
performs, say, a spin measurement./
But a measurement (whatever in the world that means) does not need
to be made and there is nothing special about Joe, if Everett
is right the same thing happens every time an electron in Joe's skin
encounters a photon, or for that matter whenever an electron
anywhere encounters anything.
That's where MWI gets fuzzy.
Not more than QM itself. We can define a world by a branch of the
universe wave. But such world will be “world” only as part of a
personal history. Everett disagrees, but his “relative state” is a
better wording than “many-worlds” which is often confusing.
Do all the submicroscopic events that make to macroscopic difference
create different worlds? That can't be right because "worlds" are
classical things. So the Heisenberg but problem seems to reappear in
different form.
Heisenberg cut disappear, it is just that worlds differentiate from
our perspective when they make difference for us, like when they can
no more interfere. There is no cut, only the quantum wave (in the
Schroedinger picture) and relative state related to macroscopic
irreversibility, which needs only the classical chaos to be
irreversible FAPP. Histories are internal things, already a form of
first person plural notion.
Right. But how FAPP does it have to be, how irreversible, in order that
it constitutes a conscious distinct state? That's how the Heisenberg
cut problem reappears at a different level.
Brent
--
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.
