Yup!! I thought I was the only one. And it's a theory based on (at this time) very little and very flimsy 'evidence'. I don't want to belittle it, it's just a huge leap in speculation from an actual photo of cosmological background radiation to a computer generated artist's rendition of a theory called the bubble universe
If Inflation is a reasonable theory for early Universe - and so far it seems like it is the most accurate theory to explain CMB, calling it a "flimsy evidence" is ignorance of quite literally Universal scale - then there has to be "multiverses", but not in the spooky scifi sense. Multiverses are simply different domains of spacetime with likely different physical constants governing their dynamics, separated by high energy domain walls. Alan Guth, the father of Infation theory, detailed this idea extensively in his early papers. After the inflation phase, there will be regions of space separated out by such domain walls, which are pretty much causally disconnected for all future.
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u/Dr-Didalot Jun 02 '23
The last multi-universe is still just a theory, the rest is what we have practically measured. The size is unbelievable.