In a very short note Okun' shows that different established upper limits on the photon charge are based on theoretical asumptions which are self-inconsistent (incomplete).
It's interesting to know other opinions.
[hep-ph/0505250] On the charge of the photon
|Abstract:||The papers setting upper bounds on the value of electric charge of the photon are briefly reviewed. The theoretical framework of these bounds is shown to be incomplete. Hence the bounds seem to be unreliable.|
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