Good luck to them, then; I look forward to what they can find, because any discovery will open new doors to the Universe. Anything that improves our knowledge of really deep history is a bonus. What's your view on the idea that our Universe budded off a preceding mother-universe?
The key to me taking the position that I do on Bubble Universe Theory is related to entropy and the laws of thermodynamics.
http://www.entropylaw.com/ That site has some good links about entropy and the laws.
My understanding of Bubble Universe Theory comes from the internet sites like Wikipedia and Google searches.
Probably the most appropriate discussion that addresses bubble universes is Tegmarks’ classification of Multiverse hypotheses in physics. I snip from
the Wiki page: , but go there and read the various classifiactions:
Tegmark's classification
Cosmologist Max Tegmark has provided a taxonomy of universes beyond the familiar observable universe. The levels according to Tegmark's classification are briefly described below.[2][3]
Level I: Beyond our cosmological horizon
A generic prediction of cosmic inflation is an infinite ergodic universe, which, being infinite, must contain Hubble volumes realizing all initial conditions.
An infinite universe should contain an infinite number of Hubble volumes. All will have the same physical laws and physical constants ...
Level II: Universes with different physical constants
"Bubble universes", every disk is a bubble universe (Universe 1 to Universe 6 are different bubbles, they have physical constants that are different from our universe), our universe is just one of the bubbles.
...
Level III: Many-worlds interpretation of quantum mechanics
Hugh Everett's many-worlds interpretation (MWI) is one of several mainstream interpretation of quantum mechanics. In brief, one aspect of quantum mechanics is that certain observations cannot be predicted absolutely. Instead, there is a range of possible observations each with a different probability. According to the MWI, each of these possible observations correspond to a different universe. Suppose a die is thrown that contains 6 sides and that the result correspond to a quantum mechanics observable. All 6 possible ways the die can fall correspond to 6 different universes. (More correctly, in MWI there is only a single universe but after the "split" into "many worlds" these cannot in general interact.)[6]
Tegmark argues that a level III multiverse does not contain more possibilities in the Hubble volume than a level I-II multiverse. In effect, all the different "worlds" created by "splits" in a level III multiverse with the same physical constants can be found in some Hubble volume in a level I multiverse. Tegmark writes that "The only difference between Level I and Level III is where your doppelgängers reside. In Level I they live elsewhere in good old three-dimensional space. In Level III they live on another quantum branch in infinite-dimensional Hilbert space." Similarly, all level II bubble universes with different physical constants can in effect be found as "worlds" created by "splits" at the moment of spontaneous symmetry breaking in a level III multiverse.[5]
Related to the many-worlds idea are Richard Feynman's multiple histories interpretation and H. Dieter Zeh's many-minds interpretation.
Level IV: Ultimate Ensemble
The Ultimate Ensemble hypothesis of Tegmark himself. This level considers equally real all universes that can be defined by mathematical structures. This also includes those having physical laws different from our observable universe.
End Wiki snips
Level 2 is where bubble universes are addressed and each bubble has its own physics.
In Level 3, spontaneous symmetry breaking can lead to bubble universes. However, all of those possibilities seem to be exposed to entropy and all of the multiverse theories that are inflationary also are “after” some determining event that causes inflation, i.e. a big bang type of event is one example. None of them discuss how they defeat entropy or what caused the initial expansion as far as I know, and that is what differentiates QWC from multiverse theories like Bubble Theory.
In QWC, entropy is defeated by “arena action”, an idea that there is a greater universe in good old three dimensional space made up of many intersecting arenas.
And in QWC, each arena originates in the overlap of other expanding arenas because overlaps cause galactic material to form a new center of gravity into which they collapse into new big crunches.
Unless you have read my threads you won’t know what I refer to as arena action. Here is a brief recap that might give you an idea. Think of our expanding universe as a single arena.
Ours is one of a potentially infinite number of arenas across the greater universe.
Imagine our arena continuing to expand until it intersects and overlaps with another expanding arena.
Expansion momentum from big bang types of events has set both of these intersecting arenas into expansion. If they don’t intersect, they will expand eternally (referred to as Eternal Inflation), but in QWC arenas are spread throughout the greater universe and so they will always intersect and overlap.
When they overlap, the expansion momentum is interrupted, and in the overlap space, the mixing and mingling galaxies of each separate arena form their own new center of gravity. Gravity thus overcomes expansion momentum and the galactic material in the overlap collapses into a big crunch. Big crunches in QWC lead to new expanding arenas with the help of some ideas about how crunches burst into expansion.
The big crunch forms around the center of gravity “3” of the overlap, while the rest of the two arenas are continuing to expand. Eventually the big crunch will reach critical capacity, burst into expansion in the same three dimensional space that was previously occupied by the overlap. Thus the ideas in QWC suggest a way for entropy to be defeated, a way that each arena utilizes existing energy from previous arenas, and a way that the greater universe can exist eternally without completing entropy, i.e. without the
heat death of the universe and without the
Big Rip.