论文标题
如何构建线性发展的宇宙空隙目录
How to Build a Catalogue of Linearly-Evolving Cosmic Voids
论文作者
论文摘要
宇宙空隙提供了对宇宙结构的起源和演变的强大探测，因为它们的动力学可以保持到当今的近乎线性。结果，他们有可能在晚期将大规模结构连接到早期的物理学。但是，现有的基于“分水岭”的算法在低红移时定义了它们的形态学特性。因此，所得区域表现出线性动力学的程度是不确定的，并且与初始密度场的演变没有直接的联系。最近的空隙定义通过考虑“反哈洛斯”来解决这些问题。这种方法包括颠倒$ n $体体模拟的初始条件，以交换过度和不足。在演变出一对初始条件后，反哈拉斯是由原始模拟中的光环内的倒置模拟中定义的。在这项工作中，我们使用Zel'Dovich近似量化了反哈洛斯和流域空隙的非线性程度。我们发现非线性是由半径小于$ 5 \，\ mathrm {mpc} \，h^{ - 1} $引入的，并且可以通过删除这些voids将反halos和流域的空隙置于高度线性的集合中。
Cosmic voids provide a powerful probe of the origin and evolution of structures in the Universe because their dynamics can remain near-linear to the present day. As a result they have the potential to connect large scale structure at late times to early-Universe physics. Existing "watershed"-based algorithms, however, define voids in terms of their morphological properties at low redshift. The degree to which the resulting regions exhibit linear dynamics is consequently uncertain, and there is no direct connection to their evolution from the initial density field. A recent void definition addresses these issues by considering "anti-halos". This approach consists of inverting the initial conditions of an $N$-body simulation to swap overdensities and underdensities. After evolving the pair of initial conditions, anti-halos are defined by the particles within the inverted simulation that are inside halos in the original (uninverted) simulation. In this work, we quantify the degree of non-linearity of both anti-halos and watershed voids using the Zel'dovich approximation. We find that non-linearities are introduced by voids with radii less than $5\,\mathrm{Mpc}\,h^{-1}$, and that both anti-halos and watershed voids can be made into highly linear sets by removing these voids.
