[extropy-chat] Is Many Worlds testable?

scerir scerir at libero.it
Sun Dec 31 08:53:19 UTC 2006

The Avantguardian:
> So did I resolve anything? No. If you are confused
> well join club. :)

Look, if we are confused is something!

How the Copenhagen Interpretation (to say it better
J. von Neumann and Heisenberg) would explain it?
|                  | 
|                  |
|           m      |
|           |      |
|        s  |      |
|           |      |
|                  |
|                  |

t0 is the emission of the particle and t2 
is the time the particle takes to reach a face 
of the box and t1 is the time the particle takes 
to reach the surface m. t0 < t1 < t2.

Now imagine that the (only one) observer (in the
only one world) does _not_ see the flash of light
at time t1, because the particle did _not_ hit,
at time t1, the scintillating surface m.

At t1, the quantum superposition
    c1 |particle hits the surface m at t1> + 
    c2 |particle hits a face of the box at t2> 
collapses, because at time t1 the (only one)
observer knows, perceives, realizes that the event
described by 
    c1 |particle hits the surface m at t1>
did not happen.

So, according to the CI, there is a collapse here
even without a physical measurement, without 
a physical interaction between the particle
and the surface m (or whatever else).

My question was: what about the MWI now?
Can it explain what happens, avoiding
the role of the consciousness/knowledge
of the observer? (I'm _not_ sure about
that, because even here the observer
realizes, knows, at time t1, he is living
in a world "B", because he did _not_ see
any flash of light, but he did _not_
perform any kind of physical measurement.
I may be wrong, of course.)


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