Axion interpretation of the PVLAS data?
Abstract
The PVLAS collaboration has recently reported the observation of a rotation of the polarization plane of light propagating through a transverse static magnetic field. Such an effect can arise from the production of a light, mA ~ meV, pseudoscalar coupled to two photons with coupling strength gAγ ~ 5x10-6 GeV-1. Here, we review these experimental findings, discuss how astrophysical and helioscope bounds on this coupling can be evaded, and emphasize some experimental proposals to test the scenario.
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