Pre-galactic cooling flows and baryonic dark matter

It is argued that the dark matter in galactic haloes consists of jupiters made in pre-galactic or protogalactic high-pressure cooling flows. These would be analogous to the cluster cooling flows observed at the present epoch but on a smaller scale. This possibility arises naturally in a variety of cosmological models, including the hierarchical clustering scenario, the pancake scenario, and the explosion scenario. In most cases, one would expect the jupiters to form in clusters of between 106 and 1011 solar masses, depending on the dominant cooling mechanism. X-ray background limits place constraints on the scale of the cooling flows but not the epoch. (author)