Pulsar Bound on the Photon Electric Charge Reexamined
Georg G. Raffelt
Abstract
If photons had a small electric charge Qγ their path in the galactic magnetic field would be curved, leading to a time delay between photons of different frequency from a distant source. Cocconi's previous application of this argument led to a limit which is too restrictive by a factor of about 200; the corrected bound is Qγ/e10-29.
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