Abstract
In the presence of anisotropic cosmic expansions at global or local scale the equations of electrodynamics in expanding spacetime are modified and presented here. A new effect should arise in regions of local anisotropic expansion in a cosmologically isotropic background. These regions should naturally exist, being connected with scales decoupling from the Hubble flow. Possible observational consequences of this effect are suggested. In particular, we predict the appearance or variation of the polarization of electromagnetic radiation coming from or passing through these regions. This effect is observable and possibly already observed in the polarization of quasars.
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