On 12/11/2013 1:26 AM, Bruno Marchal wrote:
On 11 Dec 2013, at 02:23, LizR wrote:
On 10 December 2013 09:06, Jason Resch <[email protected]
<mailto:[email protected]>> wrote:
Bell's theorm proves that local hidden variables are impossible which
leaves only
two remaining explanations that explain the EPR paradox:
1. Non-local, faster-than-light, relativity violating effects
2. Measurements have more than one outcome
In light of Bell's theorem, either special relativity is false or
many-world's is true.
Bell realised there was a third explanation involving the relevant laws of physics
operating in a time symmetric fashion. (Oddly this appears to be the hardest one for
people to grasp, however.)
But the many worlds don't disappear, unless you invoke a sort of quantum conspiracy,
which might be true,
The "conspiracy" would be some future boundary condition. Note that if the universe is
finite then there are only finitely many possible future states, which implies that there
is a smallest non-zero probability. This would imply that the action of decoherence will
make the off diagonal terms of an einselected density matrix exactly zero - which is like
a real collapse or epistemically a simple probability prediction.
Of course it appears that the universe, even the observable universe, is not finite -
although it is finite at any epoch.
Brent
but it begins to look like a super-selection of one branch among the many, and it has to
use some special initial conditions. It works logically, if you add non-comp, as with
comp, you get the many computations anyway, without quantum nor comp conspiracies or
super-determinism.
Bruno
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