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The Inhomogeneity Expansion for Planar Q.E.D in a Magnetic Background
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The Inhomogeneity Expansion for Planar Q.E.D in a Magnetic Background
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The effective action for Q.E.D in external magnetic field is constructed using the method of inhomogeneity expansion. We first treat the non-relativistic case where a Chern-Simons like term is generated. We then consider the full relativistic theory and derive the effective action for the $A_{\mu}$ fields. In the non-relativistic case we also add a 4-fermi type interaction and show that under certain circumstances, it corresponds to a Zeeman type term in the effective action.
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