🚀 go-pugleaf

bhoughto@sedona.intel.com (Blair P. Houghton) writes:

>In article <1d1tk9INNsk8@network.ucsd.edu> mbk@lyapunov.ucsd.edu (Matt Kennel) writes:
>>svetlich@math.rutgers.edu (George Svetlichny) writes:
>>: Thus standard QM does not allow for correlation signals between commuting
>>: observables. Space-like separated observables commute, so there are no
>>: correlation signals between them *at all*, be they superluminal, luminal,
>>: or subluminal.
>>
>>How are conservation laws enforced?

>Spottily.

Or, if you go to a covariant formulation of relativistic QM (so that
the spottiness in all genuine conservation laws disappears), the answer
is "locally."  Conserved quantities have densities and currents which
obey a local continuity equation:  increase in stuff within a local
region is equal to the total inflow of current, and likewise for flow
the other way.  No nonlocal dynamics are necessary.

Now, these quantities are quantum-mechanical operators, so you might
say that putting a system into a superposition of states with different
distributions of the conserved stuff requires a nonlocal effect when
a measurement occurs.  What George Svetlichny means is that such
nonlocal effects don't allow you, for instance, to manipulate an
observable over there by measuring one over here, since by spacelike
commutation, probabilities for values of the one over there are
independent of whether or not the measurement over here has happened 
yet.

>				  "The owls are not what they seem."
>				  -A giant.

Of course, we don't know what Garland Briggs knows about this.
-- 
Matt McIrvin