抓住老虎的尾巴：利用外晕密度轮廓探测结构的转向半径
Getting the tiger by the tail: Probing the turnaround radius of structures with outer halo density profiles
AI总结：
本文提出一种基于球形坍缩的半解析方法，利用外部暗物质晕密度轮廓的普适几何特征来探测和测量结构的转向半径。
摘要：
在本文中，我们发展了一种新的半解析方法来量化外部暗物质晕的密度轮廓，其动机在于这些轮廓在内部晕的广泛动力学参数范围内表现出显著的普适性。我们表明，我们基于球形坍缩的极简模型在其输入参数围绕当前已知值发生显著变化时仍具有稳健性，并确定转向半径是该问题中最重要的尺度。基于这一观察，我们认为转向半径准确地代表了向外部密度轮廓的过渡，并且我们基于外部轮廓的几何特征提供了一个普适性检验，作为测量结构转向半径的方案。
英文摘要：
In this paper we develop a new semianalytical approach to quantifying the density profile of outer dark matter halos, motivated by the remarkable universality those profiles, for a wide range of dynamical parameters of the inner halos. We show that our minimalist spherical collapse based model is robust under significant variations of its input parameters around the currently known values and we identify the turnaround radius as the most important scale of the problem. Based on that observation, we argue that the turnaround radius accurately represents the transition to the external density profile, and we provide a universal test based on geometrical characteristics of the outer profile as a proposal for measuring the turnaround radius of structures.
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。
