On 5/9/2025 5:03 AM, John Clark wrote:
On Wed, May 7, 2025 at 8:58 PM Brent Meeker <[email protected]> wrote:
/>>> that doesn't mean you can't measure them both precisely/
*>> But thanks to Heisenberg's uncertainty principle you can't
predict what that measurement will be, and even if you repeat
conditions exactly you will not get the same measurements for
momentum and position (or energy and time) if you perform the
experiment again.*
/> Yes, exactly. But my point is that the fact that you can
measure both precisely for the same particle is commonly denied.
The problem in is that the HUP applies to an ideal measurement,
one that leaves the system having the measured value, in other
words a preparation./
*In physics experiments "preparation" means making sure a system is in
one and only one quantum state. The big question is what was the state
of the system before it was prepared? Many Worlds says it was in every
state that is not forbidden by Schrodinger's Equation. Copenhagen says
I am not allowed to ask that question. But I ask it anyway.*
That's a funny way of putting MWI. When there's a measurement of a
variable A then the system is in an eigenstate of A, say Ao. Other
eigenstates of A, say Ai, are postulated to obtain in other worlds. But
in this world, where we've measured and observed Ao, we can measure
again and again get Ao (that's why it's a "preparation"). But even
though the Ai are still solutions of Schroedinger's equation, their
amplitudes are all zero. So ask away. Are there multiple worlds with
zero probabilities?
Brent
*
*
***John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
ina*
*
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