On 11 Nov 2014, at 08:40, Bruce Kellett wrote:
meekerdb wrote:
On 11/10/2014 10:35 PM, Bruce Kellett wrote:
meekerdb wrote:
On 11/10/2014 8:41 PM, 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. 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, so splitting is instantaneous everywhere
(local in configuration space!) 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.
Decoherence is a dynamic process and presumably spreads at SoL.
I don't think it is quite that simple. Sure, decoherence is a
physical process that is no more than SoL. But enough of the
environment is affected within a few microseconds -- before light
reaches the lab walls, for the worlds to have split. The rest of
the split is then instantaneous (think about it....)
You mean for enough of the environment to have interacted so that
the process is effectively irreversible. Yes, I think that's
right. Usually the lab walls and other stuff are only nano-seconds
away. But if a neutron out in space is going to beta decay it may
be a while before significant environment is entangled due to the
finite SoL.
Oh, I don't know. The CMB is pretty universal, and that tends to
interact with things.
What do you mean by the CMB?
Bruno
Bruce
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