Superlarge-Scale Structure in N-body Simulations

Abstract

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 five cosmological models with COBE normalized CDM-like power spectra are studied. The wall-like Super Large Scale Structure with parameters similar to the observed one is found for the OCDM and LCDM models with Omega_m h = 0.3 & 0.245. In these simulations, the rich structure elements with a typical value for the largest extension of \~(30 - 50) h^-1 Mpc incorporate ~40% of matter with overdensity of about 10 above the mean. These rich elements are formed due to the anisotropic nonlinear compression of sheets with original size of ~(15 - 25) h^{-1} Mpc. They surround low-density regions with a typical diameter ~(50 - 70) h^{-1} Mpc. The statistical characteristics of these structures are found to be approximately consistent with observations and theoretical expectations. The cosmological models with higher matter density Ω_m=1 in CDM with Harrison-Zeldovich or tilted power spectra cannot reproduce the characteristics of the observed galaxy distribution due to the very strong disruption of the rich structure elements. Another model with a broken scale invariant initial power spectrum (BCDM) shows not enough matter concentration in the rich structure elements.

17 pages, 11 figures, to be published in MNRAS

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Cited by in corpus (13)

• Supernovae Ia Constraints on a Time-Variable Cosmological "Constant"
• Voids in the LCRS versus CDM Models
• Void Scaling and Void Profiles in CDM Models
• Beyond two-point statistics: using the minimum spanning tree as a tool for cosmology
• Statistical characteristics of formation and evolution of structure in the universe
• Topology and Geometry of the CfA2 Redshift Survey
• Large Scale Structure at z=1.2 Outlined by MgII Absorbers
• A simplified model of the formation of structures in the dark matter, and a background of very long gravitational waves
• Detection of 20-30 Mpc-scale Galaxy Structures Embedded in 100 Mpc-scale Structures of Quasars and MgII Absorbers at z~0.8 and z~1.2
• Statistical characteristics of simulated walls
• Regular and chaotic dynamics of non-spherical bodies. Zeldovich's pancakes and emission of very long gravitational waves
• Redshift distribution of {\bf Ly-$\alpha$} lines and metal systems
• Properties of observed Ly-$\alpha$ forest