The ħ → 0 Limit of QED
Covariant perturbation theory solutions of quantum electrodynamics indicate that charged particles interact through the Feynman photon propagator, DF. The difficulty of establishing the classical-correspondence limit for QED interactions exists because these DF propagators propagate interactions into the past and future; these interactions have no obvious connection with the classical physics of particles interacting via retarded Lienard-Wiechert potentials.
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- 2.R.P. Feynman and A.R. Hibbs, Quantum Mechanics and Path Integrals (McGraw-Hill Publishing Co., 1965 ).Google Scholar