The plasma universe theory basically suggests that everything in the Universe, i.e., the Sun, stars, comet tails, all are a result of some electrical processes. Many of these universes … These distinct universes within the multiverse theory are called parallel universes. Variants on this approach include Lee Smolin's notion of cosmological natural selection, the Ekpyrotic universe, and the Bubble universe theory. The universes that form are called “bubble universes” because they bubble up where energy is being concentrated.

There's a theory floating around that the Universe could also look like a stretching sheet or Mobius strip. The multiverse is a theory in which our universe is not the only one, but states that many universes exist parallel to each other. Different plasma theories state that the space we observe is filled with enormous filaments of electrons and ions, and these are distorted due to the strong electromagnetic forces, thus giving birth to huge physical matters like galaxies. A variety of different theories lend themselves to a multiverse viewpoint. Essentially, Einstein's novel theory of general relativity didn't hold up when used to describe the universe as a whole.

This "Hubble Bubble" around our galactic cluster, which is rather oddly shaped to be surrounded by one, has yet to be proven.

General relativity described the "geometry" of spacetime as being a trampoline-like surface; planets are heavy bowling balls that distort the surface, creating curves. Not all physicists really believe that these universes exist.

Critics of the multiverse-related explanations argue that there is no independent evidence that other universes exist. In eternal inflation, the quantum fluctuations in the vacuum energy result in “bubble universes.” The possible energies that such a universe could have (called the false vacuum) are represented by a graph that looks kind of like a mountain range, which is often referred to as an energy hill.The true vacuum of our universe is represented as one of the valleys in such a graph. Inflation within a single bubble can create a smooth Universe with a hyperbolic geometry, just as is required for a Universe of subcritical density. the "Bubble Universe" theory isn't really that new, and it certainly doesn't "solve" any universal expansion theory. A recent paper co-authored by Vilenkin describes the possibility that bubble universes were created inside of the visible universe during the Big Bang.