The inflationary multiverse envisions new universes emerging from older universes. To explain the rapid expansion of space (in all universes), it posits the existence of an inflaton field. To explain the origin of these new universes, it further posits that when the energy of the inflaton field shuts off in precise ways in local areas of individual universes, new “bubble” universes will emerge. Though these new universes would not have different laws and constants of physics, they could, according to proponents of this model, have quite different configurations of mass and energy, making the
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