LARGE-SCALE STRUCTURE IN A TEXTURE-SEEDED COLD DARK MATTER COSMOGONY

We study the formation of large-scale structure by global texture in a flat universe dominated by cold dark matter. We have combined a code for evolution of the texture fields with an N-body code for evolving the dark matter. The results indicate some promising aspects: with only one free parameter, we reproduce the observed galaxy-galaxy correlation function, find clusters of galaxies to be significantly clustered on a scale of (20-50)h-1 Mpc and find coherent structures of over 50h-1 Mpc in the galaxy distribution. The large-scale streaming motions observed are in good agreement with the observations: the average magnitude of the velocity field smoothed over 30h-1 Mpc is 430 km s-1. Global texture produces a cosmic Mach number that is compatible with observation. We also see significant evolution of clusters at low redshift. Possible problems for the theory include too high velocity dispersions in clusters, and voids which are not as empty as those observed.