Energy field waves propagate in the fabric of spacetime. Interaction between spacetime field propagation and matter will generate physical photons. There are three regions of spacetime; (1) events in timelike region corresponding to the expanding universe, (2) events in lightlike region, the fabric of spacetime corresponding to spacetime with no expansion, (3) events in spacelike region corresponding to residual or evanescent universe. Universe is similar to a harmonic oscillator with two phase, right and left expansions. The equilibrium position for a two phase universe is the fabric of spacetime with surge of the stored energy in a singularity, expanding into the next phase of expansion. The evanescent universe is the spacelike event region where mass will decay. Expansion of universe and creation of matter is due to energy field propagation and superposition of energy fields in the fabric of spacetime.

lightlike event, energy fields, fabric of spacetime, timelike event, expanding universe, spacelike event, evanescent universe, universe as a harmonic oscillator, creation and annihilation of matter