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09 February 2025
 
  » arxiv » astro-ph/0107011

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Mean-pairwise peculiar velocity in cosmological N-body simulations: time-variation, scale-dependence and stable condition
Toshiyuki Fukushige ; Yasushi Suto ;
Date 2 Jul 2001
Subject astro-ph
AbstractWe report on the detailed analysis of the mean-pairwise peculiar velocity profile in high-resolution cosmological N-body simulations ($N=8.8 imes 10^6$ particles in a sphere of $50 sim 200$Mpc radius). In particular we examine the validity and limitations of the stable condition which states that the mean {it physical} separation of particle pairs is constant on small scales. We find a significant time-variation (irregular oscillatory behavior) of the mean-pairwise peculiar velocity in nonlinear regimes. We argue that this behavior is not due to any numerical artifact, but a natural consequence of the continuous merging processes in the hierarchical clustering universe. While such a time-variation is significant in a relatively local patch of the universe, the global average over a huge spatial volume $simgt$(200Mpc)$^3$ does not reveal any {it systematic} departure from the stable condition. Thus we conclude that the mean-pairwise peculiar velocity is rather unstable statistics but still satisfies the stable condition when averaged over the cosmological volume.
Source arXiv, astro-ph/0107011
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