On 5/13/2025 3:30 AM, John Clark wrote:
On Mon, May 12, 2025 at 4:47 PM Brent Meeker <[email protected]>
wrote:
*>> There is absolutely nothing in Schroedinger's equation
that says the amplitude of the universal quantum wave
collapses to exactly 1 and is zero everywhere else when a
measurement is made, there isn't even anything in it that
explains what a "measurement" is. The rule you mention was
added on by the Copenhagen people, so according to them there
are two separate rules of physics, one set of the laws of
physics is for things that are not being observed, and the
other set of the laws of physics are for things that are being
observed. Many Worlds advocates say there is only one set of
the laws of physics. *
/
> And apparently that there is no such thing as a measurement
leaving a system in an eigenstate of an observable. This is will
come as a surprise to many experimentalist./
*Your confusion arises, as always, because you are _assuming_ that
only the electron must obey Schrodinger's Equation, _not_ the lab
equipment needed to measure the electron, and most importantly _not_
the experimentalist who is looking at the measuring device; they still
follow classical physics. That clumsy poorly defined assumption was
just tacked on by the Copenhagen people because they were frightened
by the logical consequence of not doing so. That's why Many Worlds is
barebone no-nonsense Quantum Mechanics that contains everything that
is necessary and not one bit more. As Richard Feynman said “nature
isn't classical, dammit".*
I made no such assumption. You're just making up objections. Are you
asserting that a measurement does *not* leave a system in an eigenstate
of the variable measured?
Brent
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