I'm a major in Physics. It's interesting but currently, I think, it wouldn't make any difference whether the universe created itself or 1000 universes merged into 1 or whatever. I would live for maximum 100 years and humankind for maybe few thousand years. It doesn't really matter!
Also, the current quantum electrodynamics, which is the front of proven theoretical physics is quite difficult to understand!
There are so many such theories M theory , a superset of String theory, I guess there's Twistor theory, and so many more! Theory of expanding universe also depends just on red shift of very far away light.