The quantum wave particle function Ψ will radiate out in a sphere 4π of EMR from its radius forming a square C2 of probability that we can interact with turning the possible into the actual!
The spherical 4π expansion of the quantum wave particle function Ψ expands in all directions forming the three dimensional space of everyday life. But at each new absorption and emission of light (photon electron coupling C2) there will be matter antimatter annihilation in just one direction forming the Arrow of Time and a new w-function of potential future probability.
Also, physics does have an explanation for the arrow of time, which is an ever increasing rate of entropy. Entropy, in this case, is best thought of as a change in states of energy (ie, energy dissipates to uniformity). So time measures a change in something, which makes sense (If nothing ever changed, we would never need time).