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Article Dans Une Revue The Astrophysical Journal Année : 2002

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

Résumé

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 \\Lambda_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 \\Lambda_i >.

Dates et versions

hal-00008457 , version 1 (05-09-2005)

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Thierry Baertschiger, Michael Joyce, Francesco Sylos Labini. Power-law correlation and discreteness in cosmological N-body simulations. The Astrophysical Journal, 2002, 581, pp.L63-L66. ⟨10.1086/346018⟩. ⟨hal-00008457⟩
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