On 2/24/2025 9:51 AM, John Clark wrote:
On Sun, Feb 23, 2025 at 6:55 PM Brent Meeker <meekerbr...@gmail.com>
wrote:
*>> the observer himself must also obey Schrodinger's
equation, not just the thing he is trying to predict. So there
is no alternative but to resort to probability. *
/> No, that can't be the fundamental reason. The HUP doesn't
derive from the quantum nature of measuring devices. /
* If Schrodinger's equation is correct, which is to say if Many Worlds
is correct, then both observations have been made in the Multiverse,
but not by the same observer.*
A statement you make with no evidence for it.
Schroedinger's equation + Born rule has worked just fine in a one world
interpretation. So MWI is not logically implied by their success.
/> SG experiment results don't depend on quantum aspects of the
apparatus./
*Of course it does!The electron is in a superposition of spin up and
spin down state, and the SG device is in a superposition of having
detected spin up and detected spin down state, and the human observer
is in a superposition of "having seen the SG device being in the spin
up state and in the spin down state. You are making the assumption
that the Heisenberg cut exists, Many Worlds has no need of that
assumption.
*
No, I'm noticing that the quantum character of the SG device has nothing
to do with your supposed splitting. It is only necessary that it
register the spin state.
/> //Zurek proposes that there must be another effect,
"envariance", whereby interaction with the environment must select
only certain a bases which survive decoherence./
*Zurek’s "envariance" means that if a system is entangled with its
environment then mathematics insists we assign equal probabilities to
outcomes in which the amplitudes in the quantum state’s expansion are
equal, and obviously the squared magnitudes of the amplitudes. And I
don't need to tell you what that leads to.*
That's not "envariance". Envariance is Zurek's proposal for how the
preferred basis problem should be solved. I guess I did need to tell
you that.
*
*
* Completely independent of Hugh Everett, string theory says that
there are 10^600 different ways 7 additional spatial dimensions can be
shrunk down and interlaced with each other with each of the 10^600
leading to a different universe. And independent of both Everett and
string theory, Alan Guth's theory of cosmic inflation along with
Andrei Linde's "eternal inflation" which explains why inflation ever
stops, leads to the conclusion that there must be even more universes,
perhaps even an infinite number of them not just an astronomical number. *
But string theory and eternal inflation don't postulate things that are
unobservable /by construction./
Brent
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