Could the really be a multiverse?
"could" = is it possible?
I dont think it is possible, since, Gravity coheres all occupied space as one { Uni }.
Multi-verse --multiple set of local universe's-- invokes the idea that seperate Universe's are moving away from each other at speeds, just beyond that of EMRadiation.
This is in a similar vein --not exactly the same-- as our current understanding of our expanding Universe and repulsive Dark Energy, wherein most galaxies are speeding away --and gaining speed-- from each other. This is the loaf of rasin bread, in the oven scenario, where the raisins are likened to galaxies and dough is the Dark Energy space between galaxies or, multiple local universe's.
1} the space between local universes is alledged to be expanding at speeds faster than radiation, ergo no two local universe's every meet and there cannot be unification as a/the, wholistically one, Universe,
2} the space between galaxies or local universe's is expanding then that space is an occupied space, ergo all are connected i.e. a line-of-relationship exists between them all ergo one unified wholistic set,
3} there is no infinite set of local universe's. There is one finite set ergo wholistically integral set of systemic and structural relationships, that, can never get outside of the positive geodesic curvature that cohere's them as one finite set.