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Astrophysical bounds on the photon charge and magnetic moment

Authors:	Brett Altschul

Institution:	^aDepartment of Physics and Astronomy, University of South Carolina, Columbia, SC 29208, USA

Abstract:	If the photon possessed an electric charge or a magnetic moment, light waves propagating through magnetic fields would acquire new quantum mechanical phases. For a charged photon, this is an Aharonov–Bohm phase, and the fact that we can resolve distant galaxies using radio interferometry indicates that this phase must be small. This in turn constrains the photon charge to be smaller that if all photons have the same charge and smaller than if there are both positively and negatively charged photons. The best bound on the magnetic moment comes from the observed absence of wavelength-independent photon birefringence. Birefringence measurements, which compare the relative phases of right- and left-circularly polarized waves, restrict the magnetic moment to be less than . This is just a few orders of magnitude weaker than the experimental bounds on the electron and neutron electric dipole moments.

Keywords:	Photon charge Photon magnetic moment Aharonov–Bohm phase
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