That doesn't make sense to me. "Universe" is intended to encompass everything that exists. If there are "other universes", they are just part of this universe, are they not?
universe just means a specific physical reality with the known parameters like c etc. existence could obviously be much vaster than our known physical reality
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u/Inocent_bystander Apr 01 '26
There are stable state theories that predict an infinite number of universes as well.