Superlarge-scale structure inN-body simulations

The simulated matter distribution on large scales is studied using core-sampling, cluster analysis, inertia tensor analysis and minimal spanning tree techniques. Seven simulations in large boxes for ve cosmological models with COBE-normalized CDM-like power spectra are studied. A wall-like superlarge-scale structure with parameters similar to the observed one is found for the OCDM and LCDM models with Q m h 0:20:3. In these simulations, the rich structure elements with a typical value for the largest extension of ,30 50 h 1 Mpc incorporate ,40 per cent of matter with overdensity of about 10 above the mean. These rich elements are formed by the anisotropic non-linear compression of sheets with an original size of ,1525 h 1 Mpc. They surround low-density regions with a typical diameter ,5070 h 1 Mpc.