On 11 Nov 2014, at 05:41, Bruce Kellett wrote:
Richard Ruquist wrote:
Bruce,
I questioned Bruno's statement that MWI universe splitting proceeds
at the speed of light on the basis of EPR experiments which seem to
suggest that the splitting proceeds faster than the speed of light.
Could you comment on this? I was unable to understand Bruno's
response.
I often find Bruno's responses opaque, to say the least. I didn't
really understand it either.
You can ask ask when you don't understand. I am not sure if you talk
about the consequence of computationalism (which need reading some of
my papers, or old posts or Russell's book), or if you mean what I say
when I assume (temporarily) QM.
But I think this might be a point of dispute in MW circles. If you
really do take the wave function to be the only reality, then that
is an intrinsically non-local object,
I don't understand this. The wave is just a solution to a wave
equation. It is a local evolution. Nothing go quicker than the speed
of light.
so splitting is instantaneous everywhere (local in configuration
space!)
No, the splitting is not instantaneous. In fact there is no splitting
at all. Only the collapse of the wave would be non-local, if that
could exist. It is not a splitting of a universe, it is a
differentiation of first person experience.
The trouble with splitting expanding at the speed of light seems to
me that this makes it a dynamical process, and there are no
Schroedinger dynamics for this.
It is the application of physics in each branch of the wave. It is a
consequence of the linearity of the wave evolution, and of the tensor
product. Indeterminacy and non-locality are explained in the
phenomenology of the observers.
After all, the Bell correlations are observed at space-like
separations, suggesting an instantaneous effect.
If I tell you that I have thrown a coin, and put a dollar in one of
two boxes according to the tail/head outcome. Send a box in
Washington, and one in Moscow, and you open the box in Moscow, and
find no dollar in the box, you know instantaneously that the box in
washington contain one dollar, without any transmission at the speed
of light. Well, the MW makes the Bell inequality violation of that
type. Instead of W or M; it is an infinite or on all the equivalent
state to up up - down down singlet state. That is weird, but it is
just QM's weirdness, and there is no transmission at a distance at all.
Bruno
Bruce
Richard
On Mon, Nov 10, 2014 at 11:01 PM, Bruce Kellett <[email protected]
<mailto:[email protected]>> wrote:
Bruno Marchal wrote:
On 08 Nov 2014, at 19:43, John Clark wrote:
On Sat, Nov 1, 2014 at 6:55 PM, Bruce Kellett
<[email protected]
<mailto:[email protected]>
<mailto:bhkellett@optusnet.__com.au
<mailto:[email protected]>>> wrote:
> MWI struggles to explain the violations of Bell's
inequality.
The Many world's interpretation easily explains the
violation of Bell's inequality;
I think Bruce was saying that the MW struggles to explain the
Bell's inequality in a local way.
I disagree with Bruce, in the sense that I take QM, that is the
verifiable interference of all terms of the waves, as a strng
evidence that what is real is the configuration space (at least
in the first approximations). Then the universal wave (meaning
by this the wave describing both the physicists and the
particles observed) explains the Bell's inequality verification
in the (first person plural) diaries of the persons involved in
an Aspect-like experience on entangled qubit.
That reminds me of what Norm Levitt (sadly no longer with us) used
to say. Brent will remember this. Norm was a great fan of Bohmian
mechanics and he always said that people get all het up about
non-locality -- het up over nothing, in his opinion. Everything is
local in configuration space, so why the fuss?
Bruce
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