Chronology in the multiverse.... One version of the multiverse suggests that our bubble universe came from a progenitor universe and that our universe itself may have spawned progeny universes. Does this not imply a chronology outside of the spacetime continuum of our bubble universe? Please help me here because I understand time to exist only back to the singularity that created our universe. But, if there were a progenitor universe, would it not have its own space-time continuum that existed "before" ours? It seems to me that our concept of time applies only from within our universe and that an infinite continuum is needed to describe the chronology of bubble universes.