[AntonioLao]

Quantum electrodynamics (QED) as a branch of modern physics for relativistic quantum mechanics culminated in the award of the 1965 Nobel Prize in Physics to Feynman, Tomonaga, and Schwinger. Reading thru their Nobel Lectures, an obvious realization emerged. This is the tacit agreement all of them shared but was never explicitly spoken of that time is multidimensional. Time has as much dimensions as space has.

Analogous to the difficulties encountered in superstring theories in finding the extra dimensions of space, time dimensions greater than two can only exist at the infinitesimal region of reality. This region is duly called quantum spacetime, where space and time always share an equal footing, their mutual interactions exactly balanced.

In order to describe this spacetime equilibrium, both space and time must be treated as vectors and precisely as null vectors. Each null vector would then have an infinite numbers of possible directions to choose from. Once a direction of time is chosen, the metric property of space begins and therefore the dynamic spacetime equilibrium symmetry is broken giving birth to both mass and energy. Billions of years later, space becomes 3-dimensional and time becomes 1-dimensional and spacetime stays at four dimensions, maybe for now.