arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.0236astro-ph.CO
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宇宙中冷暗物质的相空间结构

The Phase-Space Structure of Cold Dark Matter in the Universe

Sergei Shandarin

摘要:

本文介绍了一种新的方法,它能以前所未有的高空间分辨率计算宇宙学N体模拟中的密度、速度等场。它是基于在六维相空间的三维流形表示冷暗物质的镶嵌。通过在位形空间上投影网格来计算密度场、速度场和其它场。这种技术的应用,宇宙学N体模拟在Lambda CDM宇宙学揭示了一个更复杂的宇宙网络,然后点图或自适应SPH。此外,该方法允许唯一地定义物理空隙并直接识别和研究焦散表面。

英文摘要:

A novel method allowing to compute density, velocity and other fields in cosmological N--body simulations with unprecedentedly high spatial resolution is described. It is based on the tessellation of the three-dimensional manifold representing cold dark matter in six-dimensional phase space. The density, velocity and other fields are computed by projecting the tessellation on configuration space. The application of this technique to cosmological N--body simulations in LambdaCDM cosmology reveals a far more elaborate cosmic web then dot plots or self--adaptive SPH. In addition, this method allows to uniquely define physical voids and identify and study the caustic surfaces directly.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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