论文标题
数值相对论是基本宇宙学的新工具
Numerical Relativity as a New Tool for Fundamental Cosmology
论文作者
论文摘要
长期以来，我们对宇宙起源，进化和结构的理解的进步一直是由宇宙学扰动理论，模型构建和有效的田间理论驱动的。在这篇综述中，我们将数值相对论作为基本宇宙学的有力的新补充工具。为了说明其力量，我们讨论了数值相对性的应用，以研究从通用的非平滑初始条件开始，从而研究缓慢收缩和通货膨胀的稳健性，对等均质化，各向同性和平坦。特别是，我们描述了缓慢收缩的最新数值相对性研究如何揭示了一种基于超层性的新型非线性平滑机制，挑战了对可观察到的宇宙的大规模同质性和各向同性所需的传统观点。
Advances in our understanding of the origin, evolution and structure of the universe have long been driven by cosmological perturbation theory, model building and effective field theory. In this review, we introduce numerical relativity as a powerful new complementary tool for fundamental cosmology. To illustrate its power, we discuss applications of numerical relativity to studying the robustness of slow contraction and inflation in homogenizing, isotropizing and flattening the universe beginning from generic unsmooth initial conditions. In particular, we describe how recent numerical relativity studies of slow contraction have revealed a novel, non-linear smoothing mechanism based on ultralocality that challenges the conventional view on what is required to explain the large-scale homogeneity and isotropy of the observable universe.
