[GioM]

Take the idea a little further, to the end of the universe, and the rate of acceleration of expansion of space increases so much that stars become isolated from each other, then planets from stars, then molecules from each other, then atoms, and then quarks, the constituents of matter itself, and then....

An interesting thing happens.

When you tear a quark away from it's antiquark, you get two quarks. The energy is equal to that required to bring another quark into existence. At this point, the rate of expansion is so vast that every quark in the universe has been forever isolated from one another, and then each bursts into a sea of high-energy quark-gluon plasma. The massive energy of expansion is rapidly consumed generating these quarks, and then the expansion slows, never stopping, but continues at a much slower rate.

Wait... we've seen this before. A quark-gluon plasma, rapidly expanding from a single point, in a universe isolated from all others.

Only expansion is required to generate new universes, forever.