Just last night I came to page 276 of "Before the Big Bang" by B Clegg. "--the cosmological multiverses theory could be impossible to prove or disprove. As with many beliefs, this ends up with something other than science it is in effect theology, and has no place in cosmological sciences.
shepherless:"-- completely empty space is unstable and via statistics and probability, lumps of energy and mass will coagulate within that space.--"
The problem with these theories is,that they assume the existence of this latent energy in the pre-space nothingness, or empty space, and the nothingness is the "frontier" with space that is empty, still for anything to coagulate, even virtually, it has to have time, time even to the second power. so, I am not versed in multiverses.