论文标题
定义暗物质光环的更好方法
A Better Way to Define Dark Matter Haloes
论文作者
论文摘要
长期以来，暗物质光环被认为是大规模结构形成模型的基本构件之一。尽管它们的重要性 - 也许是因为它！ - 光环定义继续发展朝着更具身体动机的标准发展。在这里，我们提出了一个新的定义，该定义是出于身体动机的，有效独特的，无参数的：“暗物质晕是由它们自身产生的潜力绕行的颗粒收集组成的。''''''''”这一定义是由以下定义来实现的。 历史。简而言之，我们将以这种方式选择的光环称为物理光环。我们证明：1）物理光环的质量功能是压力机，只要允许塌陷的临界阈值随着峰高而缓慢变化； 2）物理晕圈聚类幅度的峰值拆分预测在统计上与仿真数据一致，准确度不得差于$ \ of $ \ 5 \％$。
Dark matter haloes have long been recognized as one of the fundamental building blocks of large scale structure formation models. Despite their importance -- or perhaps because of it! -- halo definitions continue to evolve towards more physically motivated criteria. Here, we propose a new definition that is physically motivated, and effectively unique and parameter-free: ''A dark matter halo is comprised of the collection of particles orbiting in their own self-generated potential.'' This definition is enabled by the fact that, even with as few as $\approx 300$ particles per halo, nearly every particle in the vicinity of a halo can be uniquely classified as either orbiting or infalling based on its dynamical history. For brevity, we refer to haloes selected in this way as physical haloes. We demonstrate that: 1) the mass function of physical haloes is Press-Schechter, provided the critical threshold for collapse is allowed to vary slowly with peak height; and 2) the peak-background split prediction of the clustering amplitude of physical halos is statistically consistent with the simulation data, with an accuracy no worse than $\approx 5\%$.
