On 11 Dec 2013, at 21:17, meekerdb wrote:

On 12/11/2013 1:13 AM, Bruno Marchal wrote:

On 10 Dec 2013, at 20:08, meekerdb wrote:

On 12/10/2013 12:49 AM, Bruno Marchal wrote:

On 09 Dec 2013, at 23:28, meekerdb wrote:

On 12/9/2013 12:06 PM, Jason Resch 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

That's non-local hidden variable - which is exactly what a parallel universe is.

What is non local here?

A whole world is duplicated - including remote parts.

This will include only apparent distant associations. Splitting or differentiation occurs at the speed of the interaction, which is light speed, or slower. The same occurs in the UD.

But it is distant associations that make violation of Bell's inequality a non-local phenomenon.

In one world. A good exercise is to study the paper by Bennett & Al. on quantum teleportation, *in* the Everett (MWI) frame. You can convince yourself that everything is local, including the transfer of information. Then you can see that the residual classical bits that Alice needs to send to Bob, to complete the teleportation, only provides to Bob the information of iwhich branch of the multiverse he is situated in. Everything is completely local, but appears to be not so, "locally" (in each branch).


One may say decoherence propagates via interactions within the forward light cone, but the source can be a set of spacelike events (e.g. corresponding to different measurement choices at opposite ends of an EPR experiment).

This will not change the global locality.



Whether the same occurs in the UD is just a hope,

No, it is an easy justifiable proposition. What is a hope, is that the QM gives the right global measure on the FPI. And that hope is partially fulfilled by the self-reference logic.


unless you've been able to derive spacetime from the UD process.

Yes, that is the problem. The UD might be too rich, leading to non local space time, too much white rabbits, too much non computable phenomena in the neighborhood. A brain would no more be able to filtrate consciousness, and reality would be an incoherent dream. We should abandon comp at that stage. But taking into account the computer science self-referential constraints makes such refutation much harder, and there are promising result that such constraints is enough to get the right physics.

Bruno




Brent

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http://iridia.ulb.ac.be/~marchal/



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