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Perturbative description of the fermionic projector: normalization, causality and Furry’s theorem

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Finster, Felix ; Tolksdorf, Jürgen
Date of publication of this fulltext: 08 Apr 2014 08:33


The causal perturbation expansion of the fermionic projector is per-
formed with a contour integral method. Different normalization conditions are analyzed. It is shown that the corresponding light-cone expansions are causal in the sense that they only involve bounded line integrals. For the resulting loop diagrams
we prove a generalized Furry theorem.

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