, Volume 31, Issue 3, pp 147-151

Constraints on the photon charge from observations of extragalactic sources

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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, e γ ≲ 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.

Translated from Pis’ma v Astronomicheski \(\overset{\lower0.5em\hbox{\(\smash{\scriptscriptstyle\smile}\)}}{l}\) Zhurnal, Vol. 31, No. 3, 2005, pp. 163–168.
Original Russian Text Copyright © 2005 by Kobychev, Popov.