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Inflationary Cosmology
Inflation can get started, but then it's like one of SpaceX rockets. You need another mechanism to douse the flames of the inflationary expansion. If inflation kicks off somewhere, it will kick off potentially everywhere at all times - spawning an ever increasing set of universes. Some will die stillborn, some will continue and flourish; this is known as the multiverse paradigm. So that kind of implicit expectation has to do ultimately with the inflationary theory.