There are many multiverse hypotheses, and all 3 known multiverse hypotheses are speculative and none are supported by any solid evidence. Only one is supported by facts - CSCU
here aere a few:
Bubble Universes - the multiverse consists of a bunch of "bubbles" which are all separated from all other universes
Membrane Multiverse Hypothesis - comes from string theory (which says that we are living in a three dimension "membrane" embedded in a higher dimensional world)
and, of course
CSCU - CS Crapology Universes - where multiple "fluctuating members" pop into existence in the crapology universes, where the members make contact with each other or talk to themselves.
RE: Anyplace in Europe - A-Z
Le MansHappy New year KN