This is a different discussion than the one being offered by 'the tree' on the universe being open or closed. I'd like to know if a cosmology is possible wherein there is an infinite manifold of regions coalescing or expanding, like we see in our galactic bubble structure. Think of yeasted bread dough or/and Swiss cheese. Thinking simply, if our region were approaching a wall-like attractor, couldn't we be accelerated before the beginning of collapse?

The bubble universe concept involves creation of universes from the quantum foam of a "parent universe." On very small scales, the foam is frothing due to energy fluctuations. These fluctuations may create tiny bubbles and wormholes. If the energy fluctuation is not very large, a tiny bubble universe may form, experience some expansion like an inflating balloon, and then contract and disappear from existence. However, if the energy fluctuation is greater than a particular critical value, a tiny bubble universe forms from the parent universe, experiences long-term expansion, and allows matter and large-scale galactic structures to form.

 

The "self-creating" in Andre Linde's self-creating universe theory stems from the concept that each bubble or inflationary universe will sprout other bubble universes, which in turn, sprout more bubble universes.

 

So it would seen that the only thing that would happen is that a new universe would be 'pinched off' from the old by the forces near the edge of a wall-like attractor.

Fascinating, thanks. You seem to be saying that such a large scale superstructure is not theorizable. It would be satisfying philosophically: I can live with an infinity better than a lone manifestation, and it would be humbling to know we're heading to a crunch. Physics does not necessarily follow our pet philosophies, however. At least you offer multiplicity. Are the bubbles necessarily separate informationally?

Are the bubbles necessarily separate informationally?

By definition, yes