Topological Defects in Gravitational Lensing Shear Fields
Topological Defects in Gravitational Lensing Shear Fields
复制标题
DOI：
10.1088/1475-7516/2009/09/034
复制
发表时间：
2009-06
影响因子：
6.4
通讯作者：
V. Vitelli;B. Jain;R. Kamien
中科院分区：
文献类型：
--
作者：
V. Vitelli;B. Jain;R. Kamien
弱引力透镜引起的剪切场具有典型的相干模式。我们用透镜势所描述的曲面曲率来描述剪切场中的拓扑缺陷。利用椭球晕产生的势面脐点对特征缺陷作了简单的解释。我们模拟透镜剪切图，并指出典型的缺陷配置。最后，我们展示了如何统计特性，如丰富的缺陷可以表示在透镜势的相关函数。
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.