Differentiating small-scale subhalo distributions in CDM and WDM models using persistent homology
Differentiating small-scale subhalo distributions in CDM and WDM models using persistent homology
复制标题
DOI：
10.1103/physrevd.106.023521
复制
发表时间：
2022-04
影响因子：
5
通讯作者：
J. Cisewski-Kehe;Brittany Terese Fasy;W. Hellwing;M. Lovell;Paweł Drozda;Mike Wu
中科院分区：
文献类型：
--
作者：
J. Cisewski-Kehe;Brittany Terese Fasy;W. Hellwing;M. Lovell;Paweł Drozda;Mike Wu
星系在极小尺度上的空间分布将编码有关暗物质身份的信息。我们开发了一种新的描述的晕分布使用持久的同源性总结，其中收集的点被分解成集群，循环和空隙。我们应用这些方法，连同一组假设检验，暗物质晕在MW模拟环境区域的冷暗物质（CDM）和暖暗物质（WDM）哥白尼复杂N体宇宙学模拟。假设检验的结果发现CDM和WDM结构之间存在统计学显著差异（p值≤ 0.001），持久性图的功能摘要检测到与所考虑的比较空间点过程功能摘要（包括两点相关函数）不同尺度的差异。模型之间的差异在过滤尺度为100 kpc时最为强烈，其中CDM产生大量未连接的晕簇，而WDM则产生环路。这项研究是在暗物质晕上进行的;未来的工作将涉及将同样的方法应用于现实的星系目录。
The spatial distribution of galaxies at sufficiently small scales will encode information about the identity of the dark matter. We develop a novel description of the halo distribution using persistent homology summaries, in which collections of points are decomposed into clusters, loops and voids. We apply these methods, together with a set of hypothesis tests, to dark matter haloes in MW-analog environment regions of the cold dark matter (CDM) and warm dark matter (WDM) Copernicus Complexio N -body cosmological simulations. The results of the hypothesis tests find statistically significant differences (p-values ≤ 0.001) between the CDM and WDM structures, and the functional summaries of persistence diagrams detect differences at scales that are distinct from the comparison spatial point process functional summaries considered (including the two-point correlation function). The differences between the models are driven most strongly at filtration scales ∼ 100 kpc, where CDM generates larger numbers of unconnected halo clusters while WDM instead generates loops. This study was conducted on dark matter haloes generally; future work will involve applying the same methods to realistic galaxy catalogues.