If instead of treating Planck's constant h as a constant we define u = E_{0}t where E_{0} is the emission energy. We can determine an energy equation of the form E = uf_{0} where f _{0} is the emission frequency. The equivalent mass term is then m = E/c^2.

The Yukawa potential is V(r) = -g^2[e^{-kmr}/r]. For the electromagnetic field g = 1 and since m = 0 we have a potential of 1/r. If we use our new mass term then the energy based on action varies with radial distance. This describes what sounds like the gravitational field. Except that the value of the constant k has not been determined.