From: "JACK L. URETSKY (C) 1996; HEP DIV., ARGONNE NATIONAL LAB, ARGONNE, IL 60439" <JLU@hep.anl.gov>
Date: Fri, 20 Feb 1998 13:48:49 -0600
Hi Leigh-
I disagree.
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The symmetry argument is simple: If there is a force acting on the
photon due to an electric field, what is its direction? Let me
point out in advance that a cross product does not have an
intrinsic direction. That should save some time.
If no direction can be determined then the deflection is nil.
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If no direction can be determined then the deflections
must be symmetric around zero. This, of course, obviates the possibility
of a classical "force" associated with the electric field.
Regards,
Jack