THE critical insight leading to our understanding of electromagnetic radiation was conceived by James Clerk Maxwell, namely an electric displacement current that produced magnetic effects! How is a photon emitted? During photon emission an excited atomic or molecular state pushes into the electromagnetic wave propagation medium, or non-medium, by means of electric displacement as a current. That current builds an electric field state with which it continues to oscillate as a photon. Once a photon is propagating, the physical process by which it was initiated fades like an impedance change in an acoustic or signal transmission system, or like the form of a friend in fog, and what came first becomes irrelevant. At first glance one chooses the electric displacement current as the relevant motion for kinetic energy and the electric field it produces the relevant concentration for potential energy. But, displacement current of what and concentration of what? Dielectric polarization is physically real, but what is an electric displacement current “in space” or even “in spacetime?”
A charged object is moved by another charged object “at a distance” and we say that the charged objects impose on their surroundings “an electric field.” Charged objects can attract or repel one another, which event indicates polarity in the charged objects and direction in their fields. Numerous speculations exist that posit of what the field consists. The fact that electric object motion produces magnetic effects and that magnetic object motion produces electric effects, leads to the preferred speculation that in propagation nothing else is involved and electric and magnetic effects are one another’s “of what.” This mutual support may be produced by an electron in an excited atom and imposed on a non-medium of propagation because none is needed. Given “of what” the potential energy of combined electric and magnetic fields would be caused by the electric displacement current and the kinetic potential would proceed.
However, light paths bend in gravitational fields and whether that is due to refraction or warped spacetime it still affects propagation as if the electric-magnetic mutual “of what” speculation is not the whole story. What if the present epoch began with a hot vapor filling the universe, instead of as a Big Bang “point?” Signal wavelength and period would have been very large in the hot vapor. If particles condensed from that hot vapor, part of it would be converted to matter. That loss would cool the vapor. Given a supercool vapor, condensation would likely begin everywhere and trigger further condensation in a rapid cascade to condensate. Before condensation a particle-to-be-portion of vapor could be of universe scale. Initial condensate particles and their reduced density environment could also be of universe scale. The condensed vapor energy would diminish energy outside the particles in most of the volume of the universe, and signal wavelength and period would drop. Everything would shrink and the universe would appear to expand. The condensed particle and its reduced density environment would shrink to present size in the cooled, post-condensation period of the epoch. The environment of particles would be their gravitational field, refracting passing photons or the waves comprising the Moon in orbit. Both the “Moon waves” and photons would be oscillations on the remaining, now cooled vapor filling the universe.
Given such a universe vapor, “granule unrest” as the overall fluid character of the speculation would be appropriate, and then the general sense of a compression wave with electric displacement current as kinetic energy and electromagnetic field as potential energy would apply. Then kinetic energy in photon wave propagation could be augmented by the magnetic field induced by the electric displacement current and potential energy in a photon wave could be augmented by the electric field induced by magnetic field changes. In this view the magnetic field stores and returns energy as the photon propagates. The key to this speculation is that the magnetic effects of electric field changes and electric effects of magnetic field changes are the mechanism of energy storage and release as a photon propagates as a wave in the universe vapor.