{"version":"1.0","type":"link","title":"Vertex function - Newikis","description":"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 , the antifermion , and the vector potential A. But…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400}