Direct signature of an evolving gravitational potential from the cosmic microwave background
Direct signature of an evolving gravitational potential from the cosmic microwave background
复制标题
宇宙微波背景中不断变化的引力势的直接特征
DOI：
10.1103/physrevd.60.043504
复制
发表时间：
1998
影响因子：
5
通讯作者：
M. Zaldarriaga
中科院分区：
文献类型：
--
作者：
U. Seljak;M. Zaldarriaga
我们发现，依赖于时间的引力势可以直接从宇宙微波背景（CMB）的各向异性检测。可以通过将CMB与从CMB本身的弱透镜畸变重建的投影密度场互相关来测量签名。当存在依赖于时间的引力势时，互相关给出一个信号。该方法直接跟踪暗物质，并具有良好定义的红移分布的窗口投影在密度扰动，从而避免了问题，其他建议的互相关。我们表明，MAP和普朗克将能够探测这种效应的观测相关的曲率和宇宙学常数模型，这将提供额外的约束宇宙学参数。
We show that time dependent gravitational potential can be directly detected from the cosmic microwave background (CMB) anisotropies. The signature can be measured by cross-correlating the CMB with the projected density field reconstructed from the weak lensing distortions of the CMB itself. The cross-correlation gives a signal whenever there is a time dependent gravitational potential. This method traces dark matter directly and has a well defined redshift distribution of the window projecting over the density perturbations, thereby avoiding the problems plaguing other proposed cross-correlations. We show that both MAP and Planck will be able to probe this effect for observationally relevant curvature and cosmological constant models, which will provide additional constraints on the cosmological parameters.