vertex function

In quantum electrodynamics, the vertex function is the one particle irreducible correlation function involving ψ,

\bar{\psi}

and the vector potential A.

\Gamma^\mu\equiv -{1\over e}{\delta^3 \Gamma_{eff}\over \delta \bar{\psi} \delta \psi \delta A_\mu}

It is unfortunate that the effective action Γ_eff and the vertex function Γ^μ happen to be described by the same letter. The dominant (and classical) contribution to Γ^μ is the gamma matrix γ^μ, which explains the choice of the letter.

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