Phys. Rev. Lett. 98, 261801 (2007) [4 pages]Bound on the Photon Charge from the Phase Coherence of Extragalactic RadiationReceived 28 March 2007; published 27 June 2007 If the photon possessed a nonzero charge, then electromagnetic waves traveling along different paths would acquire Aharonov-Bohm phase differences. The fact that such an effect has not hindered interferometric astronomy places a bound on the photon charge estimated to be at the 10-32e level if all photons have the same charge and 10-46e if different photons can carry different charges. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.261801
DOI:
10.1103/PhysRevLett.98.261801
PACS:
14.70.Bh, 03.65.Vf, 13.40.Em, 95.75.Kk
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