On 4/28/2022 4:48 AM, John Clark wrote:
On Tue, Apr 26, 2022 at 10:57 PM Bruce Kellett <bhkellet...@gmail.com>
wrote:
/> An important component of Everett's idea was that quantum
evolution was unitary./
Any idea that does not conform with quantum evolution being unitary is
an idea that does not conform with experimental evidence and thus has
been proven to be incorrect.
Measurement is, and always has been, described in quantum theory by
projection operators...which are not unitary. Without them there is
nothing in the theory to produce a result that can be compared to
empirical observation.
Brent
/> If one wants to persist with unitary evolution, one cannot
avoid the Schrodinger equation. This has a number of consequences
for the theory. One is that the theory is deterministic -- there
are no probabilities/
No probabilities are needed from a Multiverse point of view, but for
any observer in any particular universe
In unitary evolution per the Schroedinger equation there are no
"paticular universes", there's only a ray in Hilbert space. Multiple
universes is a FAPP viewpoint. But so is wave-function collapse.
there can only be probabilities because for them some information is
unavailable, and that's what probabilities are all about, doing the
best you can with incomplete information.
Probabilities are whatever measures satisfy Kologorov's axioms or their
logical equivalent. The information interpretation is QBism.
Brent
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