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We have considered the structure of the fundamental symmetry violating partof the photon refractive index in vacuum in the presence of constant electricand magnetic fields. This part of the refractive index can, in principle,contain CPT symmetry breaking terms. Some of the terms violate Lorentzinvariance, whereas the others violate locality and causality. Estimates ofthese effects, using laser experiments are considered.Comment: 12 page

Testing ofCP,CPT,and causality violation with light propagation in vacuum in the presence of uniform electric and magnetic fields