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.


    /> 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.


You received this message because you are subscribed to the Google Groups 
"Everything List" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to everything-list+unsubscr...@googlegroups.com.
To view this discussion on the web visit 

Reply via email to