[ExI] Aranoff-Bohm Effect (was Precognition on TV)
lcorbin at rawbw.com
Sun Jul 15 04:04:39 UTC 2007
----- Original Message -----
From: "scerir" <scerir at libero.it>
Sent: Monday, March 19, 2007 11:06 AM
> The electron interference (electron wavefunction entering
> both slits of a Young interferometer; electron wf
> choosing both paths in a Mach-Zehnder interferometer;
> etc.) is, in principle, more interesting than photon
> Because, with electrons, the interference pattern also
> depends on the (possible) existence of a magnetic field,
> inside the interferometer. Even when this field
> is completely and perfectly shielded, the amplitudes
> of the electron can feel, nonlocally or via action
> at a distance, the existence of a magnetic field,
> and the interference pattern changes.
My God. Even though the electrons are TOTALLY
SHIELDED other electrons (in QM experiments,
at least) can "feel" their effect. As I understand it,
this "Aharonov-Bohm" effect that you mention really
depends on electromagnetic *potential*. Heretofore,
was not this potential merely a mathematical convenience?
(I mean that as a serious question.)
Anyway, 25 years after the advent of quantum mechanics,
this comes out of nowhere. (For others, see the full story:
> There are several problems, or difficulties, with the
> principles of conservation here, due to that action
> at a distance, but this is another story.
Why action at a distance?? Can't potential be looked
upon as a field phenomenon? After all, look at
gravitational potential, which is so much easier for
us amateurs to think about. Sure, preRelativity folks
would say that *everything* about the trajectory
of an object in a grav field followed Newton's Laws
to a T. (No pun intended.) But now we know that
even if you magically had "gravitational shielding"
the clock would run more slowly depending on
gravitational *potential* nothing more nothing less.
(I'm not sure, but the young
> Zeilinger perhaps performed neutron interferometry
> experiments, and found that the interference pattern
> depends on the gravity field).
> Having two beams of entangled electrons, and two
> interferometers, and two shielded magnetic fields,
> it is possible to check that the second order
> interference (the output of one interferometer versus
> the output of the other interferometer) depends
> on the difference between the two magnetic fields,
> even when the two interferometers are in separated
> regions (spacelike separated also I suppose). This
> is a sort of double nonlocality, that is two say EPR
> nonlocality + Bohm-Aharonov nonlocality.
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