We all know that photons are the particle representation of an EM 2-D wavefront and as the front expands the space between photons increases. We also know that particles of matter can exhibit wave properties. So in an analogous fashion to light, I'm thinking that each of the fundamental particles has its own, universe sized, 3-D wavefront that represents all particles of its type. The fronts overlap and yield the observed particle interactions. The wavefronts are expanding at the speed of light and create the expanding universe of space that we see. The radius is the 4th dimension and is what we call time. I'm not sure how to incorporate CMBR and cosmic acceleration. Maybe we can figure this out together.