Constraints on the Photon Charge from Observations of Extragalactic Sources (original) (raw)
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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, 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.
Publication:
Astronomy Letters
Pub Date:
March 2005
DOI:
arXiv:
Bibcode:
Keywords:
- fundamental constants - radio sources - extragalactic magnetic fields;
- High Energy Physics - Phenomenology;
- Astrophysics;
- Physics - Accelerator Physics
E-Print:
12 pages, no figures, accepted to Astronomy Letters