AI 中文总结
本研究针对宇宙丝亚结构未被探索的问题，采用层级重建方案识别亚丝，发现其为统计上不同的结构，为确立宇宙网普遍层级结构提供关键依据。
AI 中文摘要
宇宙丝是层级式宇宙网最显著的特征，但其自身的亚结构仍未被探索，这与广为人知的、普遍存在的暗物质晕/亚晕层级结构不同。我们采用层级重建方案识别较大丝内部的亚丝，通过检查母丝与亚丝的径向相空间轮廓差异，证明亚丝是统计上不同的结构类别；确立普遍的丝层级结构必须考虑这些差异，这对宇宙学和暗物质研究具有重要意义。
英文摘要
Cosmic filaments are the most striking feature of the hierarchical cosmic web. Yet, their own sub-structure remains unexplored, unlike the well-known, universal halo/sub-halo hierarchy. We use a hierarchical reconstruction scheme to identify sub-filaments within larger filaments. Examining differences in the radial phase-space profiles of parent and sub-filaments, we argue that the latter constitute a statistically distinct class of structures. Establishing the existence of a universal filament hierarchy must then account for these differences, with implications for cosmology and dark matter.
Comments5 pages, 3 figures, prepared for submission to PRL
