论文标题
用宇宙空虚响起宇宙：通过堆叠的弱重力和多普勒镜头的组合分析的空隙特性
Ringing the universe with cosmic emptiness: void properties through a combined analysis of stacked weak gravitational and Doppler lensing
论文作者
论文摘要
宇宙空隙的一个重要方面是，这些不足的区域提供了有关我们宇宙特性的补充信息。与密集的区域不同，由于物质避免了空隙，并且被重型过程污染了。了解宇宙空隙的性质的第一步是正确地推断出它们的质量谱。在文献中，已经实施了各种技术。在本文中，我们审查了它们并实施了一种基于多普勒镜头的新技术。我们使用相对论$ n $ body代码，\ textsc {gevolution}来生成宇宙学质量扰动并实现三维射线追踪技术，遵循射线台的演变。我们专注于宇宙空隙的各种特性（例如空隙尺寸函数，2点相关函数和空隙的密度曲线），并将结果与它们的通用趋势进行比较。我们表明，当弱透镜与多普勒镜头相结合时，我们获得的限制甚至比单独的弱透镜更加严格。我们还从从光环示踪剂推断出的镜头和密度曲线中的空隙中的中心部分内获得了更好的一致性。简要讨论了与正在进行的和前瞻性的低红移光谱调查有关的结果的含义。
An essential aspect of cosmic voids is that these underdense regions provide complementary information about the properties of our Universe. Unlike dense regions, voids are avoided by matter and are less contaminated by baryonic processes. The first step to understanding the properties of cosmic voids is to correctly infer their mass profiles. In the literature, various techniques have been implemented. In this paper, we review them and implement a new technique that is based on Doppler lensing. We use a relativistic $N$-body code, \textsc{Gevolution}, to generate cosmological mass perturbations and implement a three-dimensional ray-tracing technique, which follows the evolution of a ray-bundles. We focus on the various properties of cosmic voids (e.g. void size function, 2-point correlation function, and the density profile of voids), and compare the results with their universal trends. We show that when weak-lensing is combined with the Doppler lensing we obtain even tighter constraints than weak-lensing alone. We also obtain better agreement between density profiles within central parts of voids inferred from lensing and density profiles inferred from halo tracers. The implication of the result relevant to the ongoing and prospective low-redshift spectroscopic surveys is briefly discussed.
