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I am not extremely well-studied in orthodox quantum field theory and come from an extremely naive point of view that would be more appropriate in 1900 rather than 2014.  I consider a $S4(1/h)$ geometry of a universe (modulo acceptance of empirical evidence I provide) as a solution to the original question of observed quantization of energy.  Here the spectrum of the Dirac operator are $+/-(2+k)h$ where $h$ is Planck constant.  Since we know from Majorana’s work that the photon has a Dirac equation as well, we can then model photons via eigenspinors of the Dirac equation.
According to Michael Atiyah’s account ( AtiyahGeometryYangMillsFields), ‘The aim of quantum field theory broadly speaking to put all elementary particles in the same footing as photons.’  The orthodox approach to the issue is the issue of quantization of a classical Yang-Mills gauge theory which has a great deal of merit within the orthodox framework.  The S4 approach would be to consider eigenspinors on $S^4(1/h)$ as the fundamental description of photons.  Elementary particles such as electrons are trivially identified with the same class of objects basically because they can be expected to obey Dirac’s equation.  Particles of a non-abelian gauge theory would in this approach be identified with the solutions of appropriate Yang-Mills and (twisted) Dirac operator.  The twist comes from the gauge group representation being tensored with the spin bundle.  In other words, there is no need to ‘quantize’ the resulting fields.