Cosmic shear full nulling: sorting out dynamics, geometry and systematics
Cosmic shear full nulling: sorting out dynamics, geometry and systematics
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宇宙剪切力全归零：梳理动力学、几何学和系统学
DOI：
10.1093/mnras/stu1861
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发表时间：
2014
影响因子：
4.8
通讯作者：
Atsushi Taruya
中科院分区：
文献类型：
--
作者：
Francis Bernardeau;Takahiro Nishimichi;Atsushi Taruya
提出了一种用于宇宙切变观测的显式全零化方案。它使得从扩展的震源分布构造剪切图成为可能，对于扩展的震源分布，其距离分布被限制在一定的间隔内。这种结构允许我们在所有尺度上建立完全独立的切变图，可以利用这些切变图来限制背景宇宙学参数和使用宇宙切变观测的全部统计能力的系统学。这种结构的另一个优点是，由于透镜的红移分布可以被任意缩小，因此可以限制由投影效应引起的尺度混合，从而允许从微扰理论计算中对大尺度剪切功率谱进行受控预测。
An explicit full nulling scheme for cosmic shear observations is presented. It makes possible the construction of shear maps from extended source distributions for which thelensdistance distribution is restricted to a definite interval. Such a construction allows us to build totally independent shear maps, at all scales, that can be taken advantage of to constrain background cosmological parameters and systematics using the full statistical power of cosmic shear observations. Another advantage of such construction is that, as the lens redshift distribution can be made arbitrarily narrow, scale mixing due to projection effects can be limited allowing controlled predictions on the large-scale shear power spectrum from perturbation theory calculations.