I should probably qualify that I am not a physisist, but that also strikes me as expected. In theory, a dark matter particle is in orbit of the center of gravit

I should probably qualify that I am not a physisist, but that also strikes me as expected. In theory, a dark matter particle is in orbit of the center of gravity [0]. However, an object is fastest when it is at the lowest point in its object. This would mean that no individual particle is hovering on the outskirts, but each particle spends most of its time there. As a result, at any given time, that is where the majority of the particles are. I have no idea how elliptical their orbits are, so it is also possible that their orbits just never take them near the center, in which case my initial condition of 0 velocity would be innacurate. (Which is good news unless we want to reinvent the Ether) [0] I practice, this is probably a nasty n-body problem as the mass is so diffuse, so "orbit" may be misleading here.