"...The interactions within each universe creates billions more..."
The quacks are in charge of the circus.
Clowns, you mean; the clowns are in charge of the circus? Lol.
http://en.m.wikipedia.org/wiki/Ekpyrotic_universe
Ekpyrotic universe
The ekpyrotic universe, or ekpyrotic scenario, is a cosmological model of the origin and shape of the universe. The name comes from a Stoic term ekpyrosis (Ancient Greek ἐκπύρωσις ekpurōsis) meaning conflagration or in Stoic usage "conversion into fire".[1] The ekpyrotic model of the universe is an alternative to the standard cosmic inflation model for the very early universe; both models accommodate the standard Big Bang Lambda-CDM model of our universe.[2][3] The ekpyrotic model is a precursor to, and part of, some cyclic models.
The ekpyrotic model came out of work by Neil Turok and Paul Steinhardt and maintains that the universe did not start in a singularity, but came about from the collision of two branes. This collision avoids the primordial singularity while preserving nearly scale-free density fluctuations and other features of the observed universe. The ekpyrotic model is cyclic, though collisions between branes are rare on the time scale of the expansion of the universe to a nearly featureless flat expanse. Observations that may distinguish between the ekpyrotic and inflationary models include polarization of the cosmic microwave background radiation and frequency distribution of the gravitational wave spectrum.[4][5]
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Turok and Steinhardt had a model were, instead of a single big bang out of a "primordial singularity", greater regions of space called branes collide, causing regions within the greater universe like our observable arena. It is still a "one universe" model, though the term multiverse applies, since there are multiple individual occurrences of brane collisions across the greater universe.
I'm more inclined to think of the physics of the greater universe as invariant, and any multiple occurrences more likely having a "sameness" as to their physics, like multiple big bangs, expanding and intersecting, and overlapping across potentially infinite space.