Ray-tracing through the Millennium Simulation: Born corrections and lens-lens coupling in cosmic shear and galaxy-galaxy lensing
Ray-tracing through the Millennium Simulation: Born corrections and lens-lens coupling in cosmic shear and galaxy-galaxy lensing
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DOI：
10.1051/0004-6361/200811054
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发表时间：
2008-09
影响因子：
6.5
通讯作者：
S. Hilbert;J. Hartlap;S. White;P. Schneider
中科院分区：
文献类型：
--
作者：
S. Hilbert;J. Hartlap;S. White;P. Schneider
上下文。弱透镜测量需要准确的理论预测来解释其结果和宇宙参数估计。目标。我们研究了宇宙切变和弱星系-星系透镜的各种近似的精度，并研究了玻恩修正和透镜-透镜耦合的影响。方法：研究方法。我们使用光线跟踪穿越千禧年模拟，一个大型的N体模拟宇宙结构的形成，来计算各种宇宙剪切和星系透镜统计。我们将光线跟踪的结果与半解析预测结果进行了比较。结果。(I)我们一致同意
Context. Weak-lensing surveys need accurate theoretical predictions for interpretation of their results and cosmologicalparameter estimation. Aims. We study the accuracy of various approximations to cosmic shear and weak galaxy-galaxy lensing and investigate eects of Born corrections and lens-lens coupling. Methods. We use ray-tracing through the Millennium Simulation, a large N-body simulation of cosmic structure formation, to calculate various cosmic-shear and galaxy-galaxy-lensing statistics. We compare the results from ray-tracing to semi-analytic predictions. Results. (i) We conrm