Domain walls, wakes, and structure formation.

We consider a cosmological domain wall model where the dark matter interacts nongravitationally with the walls. We find that the dark matter is quickly {as early as z = 100}swept up in wakes and voids, with the wakes growing with time in a self-similar manner. The dark matter wakes, of order 5h Mpc thick today, tug on the baryons, which also trail behind in wakes of similar thickness. We find that the peculiar motions induced are of the order of a few hundred km/s, coherent on a scale of order 20h Mpc. The baryon overdensities generated by the domain walls are distributed in a geometry similar to that of galaxy superclusters found in recent surveys.