Recursive graphical construction of Feynman diagrams in quantum electrodynamics
Jul, 1999
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Abstract:
We present a method for a recursive graphical construction of Feynman diagrams with their correct multiplicities in quantum electrodynamics. The method is first applied to find all diagrams contributing to the vacuum energy from which all n-point functions are derived by functional differentiation with respect to electron and photon propagators, and to the interaction. Basis for our construction is a functional differential equation obeyed by the vacuum energy when considered as a functional of the free propagators and the interaction. Our method does not employ external sources in contrast to traditional approaches.- quantum electrodynamics
- Feynman graph: higher-order
- vacuum state: energy state
- n-point function
- propagator
- photon: scattering
- electron: scattering
- external field
- graph theory
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