On 13 Dec 2017, at 22:23, Brent Meeker wrote:
On 12/13/2017 3:15 AM, Bruno Marchal wrote:
The coin does not start in a state of the kind {|heads> + |
tails>}, but it starts with a state of having mulitiple positions
and multiple momenta, spreaded in the multiverse according to the
Heisenberg Uncertainty. The tiny difference in the position can
lead to different bouncing in the box, and so, by shaking it a long
time enough, I don’t see why we could avoid a superposition of head
and tails eventually.
Decoherence is waaay faster than the time for the coin to cross the
box from one impact to another, so I don't see how a superposition
could develop from shaking the box.
But you just said:
<<
On 13 Dec 2017, at 22:15, Brent Meeker wrote:
On 12/13/2017 2:45 AM, [email protected] wrote:
BUT for a nucleus of a radioactive element, the nucleus is never
Decayed and Undecayed SIMULTANEOUSLY.
Sure it is. It's in a coherent superposition of those states until
it interacts with the environment.
>>
That is true FAPP, but in the MW, there is no collapse of the wave,
and the coherent superposition does not disappear, it just spead on
the environment itself, making the people belonging to those
environment perceiving something like a collapse, or like a divine
choice (where of course a mechanist knows that it could be nothing
more than a first person comp indeterminacy).
In the 3p view of the universal wave (or just the global one involving
the coin and the shaker of the coin), the superposition is spreaded,
indeed very quickly to all the material objects interacting with the
coin, already inside the box. The decoherence time is only the time
the universe differentiatesn and indeed, it does that very quickly,
but this does not change the fact that the differentiation is not
enough big to lead to full quasi orthogonal tail + head state after
shaking the device (box + coin) long enough.
Bruno
Brent
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