标题： 引力透镜剪切场中的拓扑缺陷 显示英文标题

标题： Topological Defects in Gravitational Lensing Shear Fields

摘要： 由于弱引力透镜效应产生的剪切场具有特征性的相干模式。 我们用透镜势描述的曲面的曲率来表述剪切场中的拓扑缺陷。 简单来说，椭球状晕轮所产生的势能面上的脐点可以解释这些特征性缺陷。 我们展示了模拟的透镜剪切图，并指出了典型的缺陷配置。 最后，我们展示了如何用透镜势的相关函数来表示诸如缺陷丰度之类的统计特性。 显示英文摘要

摘要： Shear fields due to weak gravitational lensing have characteristic coherent patterns. We describe the topological defects in shear fields in terms of the curvature of the surface described by the lensing potential. A simple interpretation of the characteristic defects is given in terms of the the umbilical points of the potential surface produced by ellipsoidal halos. We show simulated lensing shear maps and point out the typical defect configurations. Finally, we show how statistical properties such as the abundance of defects can be expressed in terms of the correlation function of the lensing potential.