[aerohead]

I haven't heard of them referred to that way, but what you describe is at the cutting edge of cosmology right now.
Some are coming to believe that black holes, massive dark matter/ energy, actually preceded the formation of visible galaxies.
They're constructing maps of the dark matter, based upon gravitational affects on visible mass.
Gravitational lensing can be observed.
Their also considering neutrinos, maybe 4- types now.