Abstract
Stellar energy loss arguments lead to strong constraints on the couplingϕγγ of a light axion-like particle to two photons. Helioscopes, like CAST, are able to imposecompetitive bounds. The PVLAS experiment has recently observed a rotation of the polarizationof a laser propagating in a magnetic field that can be interpreted as the effect of a quite strongϕγγ coupling. We present scenarios where the astrophysical and CAST bounds can be evaded,and we show that the PVLAS result can be accommodated in one of the models, providedthat the new physics scale is at very low energies.
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