[ExI] QT and SR

[Damien Broderick]

At 03:43 PM 9/6/2008 -0700, Lee wrote:

>No spookiness.  No action at a distance. No quantum weirdness.
>No bullshit at all. Nothing really to even explain (except why there
>are only two universes that come out of the whole shebang and not
>four).  What's wrong with avoiding the mumbo-jumbo and adopting
>the only coherent and sensible view, that of MWI?

And why two not four is said to be due to the vanishing cross terms, 
I think. As a physicist friend puts it in a different context: "ALL 
the action in QM systems comes in the cross terms.  From algebra you 
know (x + y)^2 = x^2 + y^2 + 2*x*y.  The squared terms are called 
intensities and the cross terms are the amplitudes times each 
other.  When you have a term for each atom in a bowling ball or 
brain, it turns out that the coefficient for each of the cross terms 
are random relative to each other due to environmental decoherence 
and they cancel out leaving the sum of intensities, which is, by 
definition, classical."

But just for the pure intellectual fun of it, Lee, suppose in the 
spirit of science fiction that you posit the reality of veridical (if 
infrequent and stochastic) precognitive correlations. Could you 
account for those in a MWI way, without any superluminal or 
reversed-time connections? Bear in mind that by hypothesis these 
effects are *larger than can be accounted for just by chance*. I 
don't think it's sufficient to say, "Hey, in a MW metaverse, weird 
shit happens all the time, but different weird shit in different universes."

Damien Broderick