Constraints on the photon charge based on observations of extragalactic sources

Details Constraints on the photon charge based on observations of extragalactic sources Constraints on the photon charge based on observations of extragalactic sources

2004-11-30

arxiv.org/abs/hep-ph/0411398v1

Astron.Lett.31:147-151,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, no figures, accepted to Astronomy Letters

Scientific paper

10.1134/1.1883345

Using modern high-resolution observations of extragalactic compact radio sources we obtain an estimate of the upper bound on a photon electric charge at the level $e_{\gamma} \lesssim 3 \cdot 10^{-33}$ of elementary charge (assuming the photon charge to be energy independent). This is three orders of magnitude better than the limit obtained with radio pulsar timing. Also we set a limit on a photon charge in the gamma-ray band (energies about 0.1 MeV). In future the estimate made for extragalactic sources can be significantly improved.

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