In multiverse cosmological models, what sort of infinities are usually used? For instance, in many models is it thought that the multiverse is a continuum - an unlistable (uncountable) infinite set comparable to the real numbers, and that it contains universes of Aleph_0 listable infinities, comparable to the set of natural numbers? And if so, how would we derive an infinite number of listable infinities from a single unlistable one, if the universes all arise from quantum fluctuations within the same field? It seems that a dimensional quantum or vacuum field can contain only so many infinities within it's dimensions. Would not just one take up all of the room in the field dimensions it occupies? It seems that if even if two are an infinite distance apart from each other, they should overlap because they are infinite.