I don't think the Born rule is implied by MWI; but it's already known to
be the only rational way to define a probability measure on a Hilbert
space (Gleason's theorem). So in a sense it's implicit in QM regardless
of interpretation.
QBism, which is a version of CI+decoherence is at least as rational as
MWI. I think the proper measure of an interpretation is whether they
suggest improvements and experiments. MWI may be better in that respect.
Brent
On 11/29/2023 4:00 AM, John Clark wrote:
On Tue, Nov 28, 2023 at 7:30 PM Brent Meeker <meekerbr...@gmail.com>
wrote:
/> MWI fans assert that it is superior because it doesn't assume
the Born rule, only the Schroedinger equation. I wouldn't claim
that the (modern) version of Copenhagen is superior to MWI, I'm
just unconvinced of the converse./
A pretty convincing argument can be made that if the Many Worlds idea
is true then the Born Rule must have the ability to predict the most
probable outcome of any quantum experiment and as an added bonus,
unlike its competitors, it can do so without adding any random
elements. However I admit nobody has ever been able to prove that Many
Worlds is the only possible explanation of why the Born Rule works,
and we already know from experiments that it does. Put it this way, if
Many Worlds is true then the Born Rule works, and if the Born Rule
works (and we know that it does) then Many Worlds MIGHT be true. But
that's still a hell of a lot better than any other quantum
interpretation anybody has managed to come up with, at least so far.
I'm not certain Many Worlds is correct, but I am certain its
competitors are wrong, or so bad they're not even wrong.
And as far as assumptions are concerned,every scientist, not just
physicists, has no choice but to assume that probability must be a
real number between zero and one, and all the probabilities mustadd up
to exactly one for any given situation, because otherwise the very
concept of probability would make no sense. And we know that taking
the square root of the absolute value is the only way to get a number
like that out of a complex function like Schrodinger's wave equation.
If Many Worlds is true, and If each version of Brent Meeker makes bets
In accordance with the laws of probability so derived, then more Brent
Meekers will make money by following the advice given by the Born Rule
than if they followed any other betting strategy. Yes some Brent
Meekers will still go broke even if they follow the Born Rule, but
most will not.
John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>
7ff
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