Consider a theoretical region of space becomes so sparse that nothing, no energy, no force exists within it. As I understand it particles would be created spontaneously then collide back into nothing. With sufficient density of spontaneous creation, is it possible the universe we see could be created near the form we see today?
The universe isn’t being pushed out by dark energy. When the big bang occurred only 1 in 10o,000,000 particles survived. What if some of those particles exists as a multi-dimensional shock wave expanding our universe in higher dimensions. They could be producing enough gravity to pull the universe apart rather than pushing from the inside.