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Tagged with birefringence quantum-electrodynamics
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Vacuum Birefringence with alternating EM waves
I read [1] that in the presence of strong static electric or magnetic fields in vacuum the refractive index changes in such a way that there is a difference of refractive index between parallel and ...
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Vacuum birefringence
Many of the papers (e.g., this) dealing with nonlinear electrodynamics treat a theory's prediction of vacuum birefringence as undesirable, but don't explain why it would be undesirable. For example:
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