Bound states and perturbation theory

A perturbative expansion for QED and QCD bound states is formulated in A0 = 0 gauge. The constituents of each Fock state are bound by their instantaneous interaction. In QCD an O(αs0)confining potential arises from a homogeneous solution of Gauss’ constraint. The potential is uniquely determined by the QCD action, up to a universal scale. The Cornell potential is reproduced for quarkonia, and corresponding ones found for higher Fock states, baryons and glueballs. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).Peer reviewe