NSBL-QF-015 The Divergence-Free Effective Action for Quantum Electrodynamics
We present a simple introduction to a manifestly gauge-invariant perturbative development for quantum electrodynamics in the effective action formalism, and in the divergence-free framework. The system involves the interaction of the photon field with a Dirac fermionic spinor field. Detailed computations are exhibited, and divergence-free expressions for one and two-loop contributions are provided.
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