There seems to be just one rigorous science whose constructs are
necessarily causal. In spite of the commonly persistent delusions,
the ephemeral escapade of Copenhagen shamanism petered out and
the momentarily waggling reason recovered its balance, as shown
below in the quotation from Itzykson and Zuber, concerning the
commutator of two free fields phi(x), phi(y):
***
[phi(x),phi(y)] = int dk[e^(-ik.(x-y)) - e^(ik.(x-y))] = iDEL(x-y)
The real distribution DEL(x) is an odd, Lorentz invariant solution
of the Klein-Gordon equation. From DEL(0,x)=0 and Lorentz invariance
we find that DEL(x) vanishes outside the light cone, i.e. in the
region x^2<0.
Measurements in separated points do not interfere, a consequence of
locality and causality.
***
One sometimes hears the defense of shamanism asserting that QM and
QFT study different phenomena. As we have seen, it's wrong.
QFT does not ignore the spooky acausal interference, but refutes it
in ten lines of its 700 pages dealing with science.
Georges.
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