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" ... Now, these diffuse, fluffy halos are incredibly important: they represent the seeds of all the bound structure in the Universe today. This includes dwarf galaxies, normal galaxies, galaxy groups, galaxy clusters, superclusters and filaments, as well as all the substructure that makes these objects up. But without that extra force — without some “sticky” force to hold it together, to exchange energy and momentum — the dark matter is destined to remain in this fluffy, diffuse state. The normal matter can form the tightly-bound structures you’re used to, but the dark matter has no way to collide inelastically, to lose momentum or angular momentum, and hence, it has to remain loosely bound and “halo-like.” ... "
" ... We know that dark matter doesn't collide inelastically with itself and lose substantial amounts of angular momentum, but we've only ever probed dark matter structure down to scales of a few thousand light-years. On scales smaller than that? It's eminently possible that there's an entire dark Universe out there — maybe even including some sort of dark "periodic table" — made of multiple different types of dark particles that interact with one another. The only restriction is that they do so at a threshold that falls below what we've already placed constraints on. ... "