DOMAIN-WALLS, WAKES, AND STRUCTURE FORMATION

We consider a cosmological domain wall model where the dark matter int eracts nongravitationally with the walls. We find that the dark matter is quickly (as early as z congruent-to 100) swept up in wakes and voi ds, with the wakes growing with time in a self-similar manner. The dar k matter wakes, of order 5h-1 Mpc thick today, tug on the baryons, whi ch also trail behind in wakes of similar thickness. We find that the p eculiar motions induced are of the order of a few hundred km/s, cohere nt on a scale of order 20h-1 Mpc. The baryon overdensities generated b y the domain walls are distributed in a geometry similar to that of ga laxy superclusters found in recent survey.