Constraints on the photon charge from observations of extragalactic sources
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- Kobychev, V.V. & Popov, S.B. Astron. Lett. (2005) 31: 147. doi:10.1134/1.1883345
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Having analyzed high-resolution observations of extragalactic compact radio sources with modern systems of radio telescopes, we obtained an estimate of the upper limit for the photon electric charge, eγ ≲ 3×10−33 of the elementary charge (assuming the photon charge to be energy independent). This is three orders of magnitude better than the limit obtained from radio pulsar timing. We also set a limit on the charge of a gamma-ray (energy ∼0.1 MeV) photon. In the future, the estimate based on extragalactic sources can be improved significantly.