Is There a Theory of Dark Matter?

We're pretty sure that dark matter doesn't have a very strong interaction with itself. We've seen huge clouds of dark matter pass right through each other. And so it's really hard to explain how you would get a dense clump of dark matter at the centere of the galaxyus, like no way to get it there. Even if you give it these interesting clump properties, it doesn't work out. Like i you said, simulated it still doesn't clup. Ju's just a lot we don't understand about how the centres of galaxies form.