Abstract
Axions in the presence of an external magnetic field can change the optical properties of the vacuum making the vacuum birefringent. If the field is inhomogeneous the two propagation modes gain an additional splitting along the direction of the field gradient, creating a Stern-Gerlach-type effect. We show here how in a mirror cavity this splitting results in bifurcation of the beam. We present the formalism that provides an effective model to study the photon-axion mixing in an inhomogeneous magnetic field. The measurable is a decrease in the light intensity of the central region. It is shown, with an appropriate mirror cavity and magnetic field, it is possible to achieve an order of magnitude beyond the CERN Axion Solar Telescope level for the coupling constant near the region of zero mass.
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