Journal Article

Effects of the size of cosmological <i>N</i>-body simulations on physical quantities – III. Skewness

J. S. Bagla, Jayanti Prasad and Nishikanta Khandai

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 2, pages 918-930
Published in print May 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14592.x
Effects of the size of cosmological N-body simulations on physical quantities – III. Skewness

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N-body simulations are an important tool in the study of formation of large-scale structures. Much of the progress in understanding the physics of galaxy clustering and comparison with observations would not have been possible without N-body simulations. Given the importance of this tool, it is essential to understand its limitations as ignoring these can easily lead to interesting but unreliable results. In this paper, we study the limitations due to the finite size of the simulation volume. In an earlier work, we proposed a formalism for estimating the effects of a finite box size on physical quantities and applied it to estimate the effect on the amplitude of clustering, mass function. Here, we extend the same analysis and estimate the effect on skewness and kurtosis in the perturbative regime. We also test the analytical predictions from the earlier work as well as those presented in this paper. We find good agreement between the analytical models and simulations for the two-point correlation function and skewness. We also discuss the effect of a finite box size on relative velocity statistics and find the effects for these quantities scale in a manner that retains the dependence on the averaged correlation function .

Keywords: gravitation; methods: N-body simulations; methods: numerical; cosmology: theory; dark matter; large-scale structure of Universe

Journal Article.  6254 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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