• How are the retarded and advanced L-W EM potentials interpreted in QFT?

    From john mcandrew@21:1/5 to All on Fri May 6 19:43:26 2022
    Before QFT was developed in its current form, the Lienard-Wiechert (LW) potentials were physically interpreted as diverging or converging from/upon an electric charge q in the retarded and advanced cases respectively. How has this picture changed
    compared to today; given that the electron is considered to be an excitation of an electron field, a photon an excitation of the electromagnetic field?

    In particular, are the electric charges still considered sources/sinks of the retarded/advanced LW potentials in today's models of CED?

    Thanks in advance,

    JMc

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