Power-law correlation and discreteness in cosmological N-body simulations

Abstract

We analyse with simple real-space statistics the Virgo consortium's cosmological N-body simulations. Significant clustering rapidly develops well below the initial mean interparticle separation Λ_i, where the gravitational force on a particle is dominated by that with its nearest neighbours. A power-law behaviour in the two point correlation function emerges, which in the subsequent evolution is continuously amplified and shifted to larger scales, in a roughly self-similar manner. We conclude that the density fluctuations at the smallest scales due to the particle-like nature of the distribution being evolved are thus essential in the development of these correlations, and not solely, as usually supposed, the very small continuous (fluid-like) fluctuations at scales larger than Λ_i >.

arXiv comment12 pages, 3 figures, some revisions to match the published version and corrected some typos. To be published in Astrophysical Journal Letters (December 20, 2002)

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