Effects of the size of cosmological N-body simulations on physical quantities – III. Skewness
Effects of the size of cosmological N-body simulations on physical quantities – III. Skewness
复制标题
宇宙学 N 体模拟的大小对物理量的影响 Ⅲ．
DOI：
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
N. Khandai
中科院分区：
文献类型：
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作者：
J. Bagla;J. Prasad;N. Khandai
N体模拟是研究大尺度结构形成的重要工具。如果没有N体模拟，在理解星系团物理学和与观测结果进行比较方面的许多进展都是不可能的。鉴于此工具的重要性，了解其局限性至关重要，因为忽略这些局限性很容易导致有趣但不可靠的结果。在本文中，我们研究的限制，由于模拟量的有限大小。在早期的工作中，我们提出了一种形式主义，用于估计有限的盒子大小对物理量的影响，并将其应用于估计聚类，质量函数的振幅的影响。在这里，我们扩展了相同的分析和估计的影响偏度和峰度的扰动制度。我们还测试了分析预测，从早期的工作，以及在本文中提出的。我们发现两点相关函数和偏度的分析模型和模拟之间的良好协议。我们还讨论了有限盒子大小对相对速度统计的影响，并发现这些量的影响以保留对平均相关函数的依赖性的方式进行缩放。
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 ¯ ξ .
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.