"Multiverse ideas stem from the fact that the universe, which is approximately a de Sitter vacuum, and objects in it such as black holes is not quantum mechanically stable. The cosmological constant is related to a vacuum energy density ρ
Λ = (8πG/c^4)(ρ 3p),
with a pressure p = -ρ. Tiny fractions of his vacuum energy density ρ, which is very small, quantum mechanically tunnels into other spacetime "bubbles," for lack of a better term here, and serves as a mass-gap or seed for the generation of a nascent spacetime or "universe." These new cosmologies will then do much the same and "ad infinitum." "
This was what I originally thought was the explanation for expanding space, that the quantum energy falling into black holes was essentially tunneling back out/traveling other dimensions, to less dense space, causing it to expand. It was someone else who convinced me that radiation would have the same effect.
The point I'm making about time isn't complicated. Any energy, motion, activity, etc. is going to change the configuration of the elements involved, be they quantum or classical. Now the conventional view is that time goes from configuration A to configuration B. My point is that the effect of the motion of the elements is creating and then replacing these configurations, so there is no "arrow" from A to B, but that both A and B come into existence and then pass out of it. A ferromagnet has orientation. Time has no orientation because the are infinite numbers of magnets pointing in all directions and the future emerges from the past, like a chick emerges from its shell, as the old crumbles away and the new gathers energy. A further point about this, that I made in response to Julian Barbour's essay on time, is that there can be no "point" in time, since it is a measure of motion, not the dimensional frame on which the series of events exist. So the only dimensionless "point" in time would require freezing the very motion being measured. It would be like stopping the fluctuation of the vacuum. Since most, if not all, energy is the motion, reality would cease to exist. So there could be no quanta of time, since that would require some point of reference to distinguish one from the next and there could be no initiation and termination points. There is simply the field of energy in motion and events/time is an effect of it.