Constraints on the photon charge from observations of extragalactic sources |
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| Authors: | V V Kobychev S B Popov |
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| Institution: | (1) Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kiev, Ukraine;(2) University of Padova, Padova, 35122, Italy;(3) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia |
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| Abstract: | 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. |
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| Keywords: | fundamental constants radio sources extragalactic magnetic fields |
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