Authors: Peter Cameron
The absence of impedances from the Standard Model is most remarkable. Impedance is a fundamental concept, of universal validity. Impedances govern the flow of energy. In particular, the coupling of the photon to matter happens in the near field. The absence of the photon near-field impedance in photon-electron interactions is the most basic and profound example of this remarkable circumstance, sitting unnoticed in the foundation of quantum electrodynamics. One cannot obtain a complete understanding of such interactions without examining the role of impedances. How this essential principle escaped notice in the development of quantum field theory is outlined, and consequences of its inclusion in our present understanding are explored.
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