Hello! i am an undergraduate and I started working with a professor doing numerical simulation of cold dark matter. I understand (more or less) the physics behind and the results are very close to observations, which is a good support for the existence of dark matter. However, I can't see the real purpose of cosmological simulations in general (as I am thinking whether should I do this for graduate school or not). Like, yes they reproduce large scale structure and important properties (velocity curve, Tully-Fisher relation, etc.), but other than reproducing observations, what can you actually do. The thing is that a "particle" of dark matter has several millions of solar masses (due to computation limitation) so you definitely can't make predictions about the type of particle we should look for (like mass, whether or not they interact weakly, etc.), for example. So what is the real goal of a physicist doing cosmological simulations? Thank you!