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Tree Universe

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One of Hawking's last publications studied the model of universe/multiverse and conjectured that the exit from eternal inflation is "finite and reasonably smooth" - in other words, the inflated boundaries of multiverses could be finite and smooth. Here is the paper link - https://link.springer.com/article/10.1007/JHEP04(2018)147.

Does any existing model suggest that there are multiverses inflating in infinite space and eventually merging into bigger universes after a long time, just like aerosols growing and merging in the atmosphere? The universe has such a large radius that it could flatten out like a drop.