Why does the classical world exist

  • #26
atyy
Science Advisor
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Is Deutsch's explanation fully conclusive?
I'm not yet fully convinced. The Deutsch/Wallace exposition is pretty convincing, but when I step back and ask, "Why should there be any probability (in the colloquial sense) at all in deterministic evolution?" The answer seems to defy common sense and I don't know if there is some subtle error.

Incidentally, there is a paper on an attempt at a modal interpretation in which quantum mechanics is really just coarse graining. In this approach, quantum mechanics is not complete, and breaks down at the smallest scales.

http://arxiv.org/abs/1312.3427
The Emergent Copenhagen Interpretation of Quantum Mechanics
Timothy J. Hollowood
2013 J. Phys. A: Math. Theor. 46 325302
 
  • #27
tom.stoer
Science Advisor
5,766
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atty, I fully agree.

I tried to explain the problems I see with probability in many-worlds here in this form. Most answers were either something like "but look, it's obvious, natural, ..." or "yes, you right, it's not convincing".

One of the biggest problem is to assign probabilities to branches which cannot be counted and which are not uniquely defined.
 

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