Comment by tmiku
3 days ago
I'm surprised that more sibling comments aren't covering the lack of a unified theory here. Currently, our best understanding of gravity (general relativity) and our best understanding of everything else (electromagnetism, quantum mechanics, strong/weak force via the standard model) aren't consistent. They have assumptions and conclusions that contradict each other. It is very difficult to investigate these contradictions closely because the interesting parts of GR show up only in very massive objects (stars, black holes) and the interesting parts of everything else show up in the tiniest things (subatomic particles, photons).
So we don't have a set of equations that we could expect to model the whole universe in any meaningful way.
At the level of writing a program to simulate the universe as we see it, ideas like classical gravity (see Penrose) would probably work.
They definitely wouldn’t work because we have strong evidence that relativity is a more accurate theory and significant evidence that either gravity does not obey an inverse square law or our estimation of the distribution or nature of dark matter is incorrect.
https://en.wikipedia.org/wiki/Newton%27s_law_of_universal_gr...