On 7/4/2021 4:28 PM, Jason Resch wrote:
On Sun, Jul 4, 2021, 8:07 AM Tomas Pales <[email protected]
<mailto:[email protected]>> wrote:
On Sunday, July 4, 2021 at 12:48:06 PM UTC+2 Bruce wrote:
But that works only if the copies are generated in the actual
quantum coin tossing experiment -- they can't be pre-existing
because then the idea doesn't work -- there is no causal
connection between the experiments and the copies. The issue
then is how the Schrodinger equation generates all these copies.
I am wondering, is it really necessary that the split into copies
occurs at measurement? Would it not be possible that all the
copies of worlds already exist before the measurement, evolving in
the same way until the moment of measurement, and at the moment of
measurement their evolutions start to differ? Causality may be
just a regularity in the temporal sequence of states of a world
where a particular state of the world is logically derived from a
prior state of the world and from the regularity. But at the
moment of measurement this regularity is broken, which may just
mean that the state of the world after the measurement cannot be
logically derived from a prior state of the world and from a
regularity; still there may be a regularity on the level of the
multiverse in the way the particular worlds start to differ from
each other at the moment of measurement, and this regularity gives
proportions of different worlds after the measurement and thereby
probabilities that we exist in a particular world.
Wei Dai, the founder of this list, proposed something quite similar, I
think:
http://www.weidai.com/qm-interpretation.txt
<http://www.weidai.com/qm-interpretation.txt>
Jason
Yes, that's more plausible interpretation since there must be myriad
microscopic, but still classical, "splits" which make no difference to
us. Then the split on observation that we're discussing is just a
division of this stream of classically equivalent worlds. Julian
Barbour wrote a book about this interpretation. So his idea was that
when there is a "measurement", something amplified to the classical
level, a proportion of the stream of world's divides according to the
Born rule. But that requires that individual worlds go this way or that
way probablistically and it's hard see how that's any improvement on
Omnes' dictum, "It's a probablistic theory so one thing happens and the
others don't."
Brent
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