The thing is, we got different laws of physics depending on what scale of universe we are looking at. Since we live in one scale, we are stupid enough to believe that the whole universe must follow the same rules. If we zoom in, we got quantum mechanics that work different. If we zoom out, we discover that the universe doesnt follow our logic, so we make up things like Dark Energy to make it work with our logic.
The thing is we don't have different laws for different scales we have different levels of understanding for different scales. There is a universal theory that will arise eventually
Source: literally every scientific theory ever
We believe that we can explain the whole universe with one theory. Perhaps we can in the future, perhaps not. Right now we cant and we got different ones for different scales. That is fact, not a theory.
I don't know what it's called but I call this the "infinite scale theory" and new scales are always being created and basically there is no end to how large something can become but only how small. This way not only would the universe expand but whatever is larger than the universe would do the same and with continued expansion you would have scales being formed over and over which would change the perspective of each observer of the new scale when considering the size of all of the other scales that currently exist to their knowledge.
For example, we have the atomic scale, our own familiar scale, and then the universal scale. Well what if there are others larger? Then, in comparison our universe may seem to some observer elsewhere to be atomic. I mean our universe is mostly empty space just like atoms are.
Yes, but the difference between what you're speculating and what physicists actually do is that the systems and models physicists describe are actually observable. All kinds of things are possible outside of our observable capabilities, an infinite number of things as a matter of fact, but speculating on them is not particularpy useful unless you can observe them. ---
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