Also, these universes must only be spherical in fashion, not shape. This allows for warps, wormholes, bridges, etc. In this way, time progresses as the universe oscillates. The cosmic background radiation is left-over light, etc. Note the energy shell creation as the matter and antimatter come into equilibrium.
Mass moves closer to the center.
This theory accounts for all aspects of relativity, the cosmic background radiation, gravity, and explains the structure of the universe. Due to lack of funding, I am unable to test this theory.