On Wed, Apr 27, 2022 at 3:43 PM Brent Meeker <meekerbr...@gmail.com> wrote:

> On 4/26/2022 7:56 PM, Bruce Kellett wrote:
> On Wed, Apr 27, 2022 at 12:32 PM Brent Meeker <meekerbr...@gmail.com>
> wrote:
>> On 4/26/2022 7:01 PM, Bruce Kellett wrote:
>> On Wed, Apr 27, 2022 at 11:35 AM smitra <smi...@zonnet.nl> wrote:
>>> You just presented an elaborate presentation involving N branching steps
>>> and counted all 2^N branches as equal. That's branch counting and it's
>>> known to not be compatible with QM. The MWI can be taken to be QM
>>> without collapse and this is known to be a consistent theory
>> It would seem that you are claiming that QM without collapse is not based
>> on Everett's ideas. If you claim that such a theory exists and is
>> consistent, then you really should present that theory, and point out that
>> it has nothing to do with Everett, or with obtaining every outcome of a
>> trial on different branches.
>> My impression is that you do not have any worked-out theory -- you just
>> throw arbitrary objections to my working through the consequences of
>> Everett's approach to quantum mechanics. I have shown that many problems
>> exist with Everettian QM. If you agree, and are prepared, with me, to throw
>> out Everett, then we agree, and there is nothing more to be argued about
>> (at least, until you present some different complete theory).
>> I think Everett's idea was just to get rid of wave-function collapse and
>> instead assert that the apparently incompatible results of an experiment
>> were just different entanglements of one's brain/instrument with different
>> superposed components of the state of the system measured.  This is all
>> consistent with the Copenhagen interpretation, except in CI all but one of
>> the orthogonal components is discarded.  Decoherence has cast some light on
>> why the components quickly become orthogonal and why they become orthogonal
>> only in certain bases.
> An important component of Everett's idea was that quantum evolution was
> unitary. That gave centrality to the Schrodinger equation. 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, and all outcomes of an
> experiment are, in some real sense, equivalent. That leads to the
> consequences that I have pointed out. If Saibal wants to avoid those
> consequences, then he has to abandon the idea of unitary evolution and the
> Schrodinger equation. I think Saibal would be reluctant to go down that
> path, so he is left with an inconsistent mess.
> I don't see that it's inconsistent.  It's just like QBism.  You get a
> result and you renormalize the wf.  Whether the other outcomes occur in
> some platonic world, is irrelevant.

OK. SO it is much more like a subjective interpretation such as QBism than
it is based on Everett. Since you do not have a single consistent wave
function in QBism, it is Okay in that theory to simply ignore
inconsistencies. as Saibal does.


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