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Problems with Many Worlds Interpretation 
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#757
Nov212, 03:46 AM

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#758
Nov212, 03:52 AM

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#759
Nov212, 03:53 AM

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BTW, what is the current position of BM with the issue about the cosmology. AFAIK, there is a hidden rest frame in BM, right? But in expanding Universe no objects 'at rest' in some frame can have timelike worldlines globally. For example, lets say that here, on Earth, the hidden rest frame is the same as 'rest to CMB'. So we have a 'hidden' center of the universe in BM :) But outside of our hubble space the 'NOW' in the hidden rest frame, normally spacelike, becomes timelike.



#760
Nov212, 03:57 AM

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In particular, his analogies (with Minkowski space in strange coordinates, as well as with classical phase space) are brilliant. Also, his terminology (nirvana and samara basis) is fun. 


#761
Nov212, 03:59 AM

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Decoherence shows that taking some basis and somehow isolating somehow 2 systems (observer and the cat), we can explain what an observer perceive. I am putting a stress on the words some/somehow, because in fact, these parameters are free, decoherence doesn't put any constraint to limit your choice (expect the observer must have high number degrees of freedom). WHY do you need any constrains on these parameters? 


#762
Nov212, 04:03 AM

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#763
Nov212, 04:12 AM

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#764
Nov212, 04:16 AM

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But I've heard that BM has a special rest frame, is it true? 


#765
Nov212, 04:18 AM

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It says that you can do it any way you want Feel the difference. 


#767
Nov212, 04:22 AM

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Then how many flavors of BM exist, and are all of them compatible? Of course, I am interested only in relativistic BM 


#768
Nov212, 04:25 AM

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"The Many World Interpretation is therefore rather a No World Interpretation (accord ing to the simple factorization), or a Many Many Worlds Interpretation (because each of the arbitrary more complicated factorizations tells a different story about Many Worlds [7])." But the manymany world interpretation is certainly not how most MWI experts see MWI, because they typically believe that decoherence fixes the basis. What Schwindt shows is that it doesn't. 


#769
Nov212, 04:27 AM

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#770
Nov212, 04:30 AM

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Exactly! But one story is special for you, because of your consciousness.
So we have a constructive disagreement  our axioms are different, I assume a special role of consciousness aka 'qualia'. 


#771
Nov212, 04:37 AM

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#772
Nov212, 04:53 AM

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Thank you. Minor question about BM: say, there are 2 observers in 2 different inertial frames. Do they agree on the 'trajectories' of BM 'particles'? (Of course, they can't observe these trajectories because they are hidden, but observers can calculate them).
Probably they would agree in BM flavor with hidden special rest frame, but what's about flavor without special hidden rest frame? 


#773
Nov212, 04:53 AM

P: 301

But to have a preferred frame in cosmology does not mean that there has to be a hidden center of the universe. It is simply a preferred foliation in the GR sense, not an inertial frame in the SR sense. Trajectories in different frames are trajectories with completely different initial values and there is no reason at all to suspect that they have something in common. But observers will not think that their own rest frame, based on the quite arbitrary Einstein synchronization, has some relation with the hidden preferred rest frame. So I think they will agree that the CMB frame is the closest candidate for the hidden preferred frame and use it, independend of their own speed, for computations. 


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