On 20 Nov 2014, at 00:54, meekerdb wrote:
On 11/19/2014 3:40 AM, Bruno Marchal wrote:
none use Positivism or any other school of philosophy because no
philosophical franchise is of the slightest help in doing what
scientists want to do, figure out how the world works.
I disagree. The collapse axiom, which is still in amost textbook,
and which is used by bad pedagog to avoid hard question, is a
philosophical axiom relying on a religious belief: the belief that
there is only one physical universe, and that we are unique.
Some physicists used it as a rule of thumb, and as a way to not do
philosophy, but of course, that is eventually like a use of God-gap
type of explanation.
It's more than a rule-of-thumb; it's the Born rule.
The collapse is not the Born rule. You can add the Born rule, like
Hartle and Graham, or derive it from the SWE, like Preskill,
Selesnick, Destouches-février, and Gleason, with more or less implicit
use of the FPI (which then must be extended to the full arithmetical
domain).
There is only projections, which correspond to yes-no observable. The
spectral decomposition is all we need, + Gleason, or more simple
treatment.
Without it, there's no way to connect wave functions to
probabilities and no way to test the theory.
The probabilities comes from the FPI on the terms where the observers
appears in the relevant relative states. It is just the same first
person selection that the one in the WM-duplication thought experience.
On the contrary, the collapse introduces a lot of magic non described
by the SWE, like indeterminacy, non-locality, irreversibility, etc.
Bruno
Brent
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