A BRIEF SURVEY OF THE VARIOUS FIELD EQUATIONS SINCE 1864
The terminology of quantum field theory (QFT) is somewhat misleading; the 'field' referred to by QFT is NOT a field, not a measureable E- or H-field at any rate, rather it is defined as a theoretical 'field'. When compared to SFT, a true 'field' theory, it is necessary to examine exactly what a field is and isn't, especially in the real world of measurements. It is thus instructive to briefly survey the main systems of equations used by physicists since the discovery of Maxwell's equations. The four equations were formulated by Maxwell in 1873 and describe the macroscopic E- and H-fields, and their associated currents, that had been measured in careful experiments by Coulomb, Faraday, Ampere, Biot, Savart and others. Several forms of EM wave equations were formulated including decoupled forms where either the E- or H-field variables appeared in isolation; Maxwell's equations were specialized for various applications e.g. where quasistationary simplifications are ssumed or where radiation conditions cannot be simplified. Hertz's potentials introduced a mixed-field substitution that lead to a Lagrangian or energy density formulation suitable for solving via integrations over radiation surfaces where infinite regions needed to be considered. These are Hertz's famous vector and scalar potential wave equations.
Following theoretical and experimental demonstrations by Planck and Einstein of the existence of a quantum physics, there was a failure by physicists to discover a mathematics based on Maxwell's equations that applied to the electron's motion in the atom. In 1926 Schrödinger used energy conservation to obtain a quantum mechanial equation in a variable called the wave function that accurately described single-electron states such as the hydrogen atom. The wave function was a variable that depended on the Hamiltonian and the total energy of the atomic system and thus was compatible with the Hertzian potential formulation. The wave function was a coupled field variables depending on the sum of the square of both the E- and H-fields as can be seen by examining the energy density function of the electromagnetic field. In 1928 Dirac realised that the wave functions were not relativistic and sought to find corresponding equations to incorporate Einstein's relativity. Dirac's equations were described in terms of two 'fields', the Dirac fields, and could be described as 'field equations of motion'. The term "Dirac's two wave equations" is also used. But like Schrödinger's equation, mixing the underlying Maxwellian fields had lead to a mathematical smearing of the fields. Thus the problem was now only 'wave-like' rather than uncoupled fields and lead Heisenberg to his uncertainty principle.
But the underlying physically measureable fields had long been lost in the potential equations; any dipole or loop measurements would not be useful (nor possible). By the time the equations governing the weak and strong nuclear forces were found using modern versions of QFT, namely quantum electrodynamics (QED) and quantum chromodynamics (QCD) the physical fields were a long-forgotten reality. So the question remains: do the E- and H-fields of Maxwell's equations where the fields are determined between point-charges exist within the nanoscopic domain of the atom? At present it has been demonstrated by SFT for the hydrogen atom that these E- and H-field forms are no longer applicable for the sub-atomic charges. What is the proof? The analytic equations obatined from EMSFT for the hydrogen atom are validated by the known spectroscopy.


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