Vertex function

In quantum electrodynamics, the vertex function describes the coupling between a photon and an electron beyond the leading order of perturbation theory. In particular, it is the one particle irreducible correlation function involving the fermion $\psi~$ , the antifermion $\bar{\psi}$ , and the vector potential A.

单词	Vertex function
释义	Vertex function 英语百科 Vertex function In quantum electrodynamics, the vertex function describes the coupling between a photon and an electron beyond the leading order of perturbation theory. In particular, it is the one particle irreducible correlation function involving the fermion $\psi~$ , the antifermion $\bar{\psi}$ , and the vector potential A.
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