On 10/13/2013 1:48 AM, Bruno Marchal wrote:
On 12 Oct 2013, at 22:53, meekerdb wrote:
On 10/12/2013 10:55 AM, Bruno Marchal wrote:
On 11 Oct 2013, at 03:25, meekerdb wrote:
So there are infinitely many identical universes preceding a measurement. How are
these universes distinct from one another? Do they divide into two infinite subsets
on a binary measurement, or do infinitely many come into existence in order that some
branch-counting measure produces the right proportion? Do you not see any problems
with assigning a measure to infinite countable subsets (are there more even numbers
that square numbers?).
And why should we prefer this model to simply saying the Born rule derives from a
Bayesian epistemic view of QM as argued by, for example, Chris Fuchs?
If you can explain to me how this makes the parallel "experiences", (then),
disappearing, please do.
I don't understand the question. What parallel experiences do you refer to? And
you're asking why they disappeared?
The question is "how does Fuchs prevent a superposition to be contagious on the
observer"
I think he takes an instrumentalist view of the wave function - so superpositions are just
something that happens in the mathematics.
When I read Fuchs I thought this: Comp suggest a compromise: yes the "quantum wave"
describes only psychological states, but they concern still a *many*
dreams/worlds/physical-realities, including the many self-multiplication.
There is no "many" in Fuchs interpretation, there is only the personal subjective
probabilities of contemplated futures.
I notice the plural of "futures". Are those not "many"?
Sure, but they are contemplated, not reified.
I know Fuchs criticize Everett, but I don't see how he makes the superposition
disappearing. he only makes them psychological, which is not a problem for me. there are
still "many".
Yes, that's why I said I think his approach is consistent with yours. I think Fuchs view
of QM is similar to what William S. Cooper calls for at the end of his book "The Evolution
of Reason" - a probabilistic extension of logic. This is essentially the view he defends
at length in "Interview with a Quantum Bayesian", arXiv:1207.2141v1
It is still Everett wave as seen from inside.
We just don't know if the dreams defined an unique (multiversal) physical reality.
Neither in Everett +GR, nor in comp.
Bayesian epistemic view is no problem, but you have to define what is the knower, the
observer, etc. If not, it falls into a cosmic form of solipsism, and it can generate
some strong "don't ask" imperative.
You assume that if others are not explained they must be rejected.
I just ask for an explanation of the terms that they introduce.
I think he takes the observer as primitive and undefined (and I think you do
the same).
Physicists, like Fuchs, and unlike philosophers, are generally comfortable with not
explaining everything.
Me too. but he has still to explain the terms that he is using.
What's your explanation for the existence of persons? So far what I've heard is that it's
an inside view of arithmetic - which I don't find very enlightening. Fuchs, correctly I
think, says an 'interpretation' of a theory, the story that goes along with the
mathematics, is important insofar as it gives you insight into how to apply the
mathematics and to extend your theories. He is critical of Everett's MWI for not doing
that, or at least not doing it well.
Brent
Bruno
Brent
"I mistrust all systematizers and avoid them. The will to a system is a lack of
integrity."
--- Fredrick Nietzsche, "Twilight of the Idols"
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