This is a speculative idea.
What if, as the universe accelerates, spacetime might eventually tear, creating what I will call “Null Zones”, which are defined as “regions where matter, energy, and even causality cease to exist.”
These zones would sever parts of the universe, leading to recursive fragmentation into isolated pockets, each evolving as its own self-contained universe. Instead of a multiverse from many beginnings, we get one original universe, slowly breaking apart.
It might also suggest that our universe exists within a higher dimension, like 3D objects breaking within a 4D framework, with each fragment forming an isolated “bubble.”
Again, this is not a formal theory, just a thought experiment.