The relativistic dipole and gravitational redshift on LSS
The relativistic dipole and gravitational redshift on LSS
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DOI：
10.1088/1475-7516/2019/04/050
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发表时间：
2018-11
影响因子：
6.4
通讯作者：
E. Dio;U. Seljak
中科院分区：
文献类型：
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作者：
E. Dio;U. Seljak
在微扰理论中，通过包含所有相关的相对论贡献，我们计算了星系关联函数在1圈的偶极。这提供了对偶极真正测量的东西的描述和理解，特别是与大尺度结构中的引力红移效应有关的测量。为了发展这种微扰方法，我们首次计算了微扰理论中相关的三阶相对论修正，包括相应的非线性星系偏差模型。这种微扰方法在很大的尺度范围内与以前基于N体模拟中测地线光跟踪的数值结果相一致，具有良好的精度。以前声称的引力红移探测可能忽略了几个相对论效应，这些效应与引力红移幅度在10 Mpc/h左右相当，并使测量的引力红移解释复杂化。
We compute the dipole of the galaxy correlation function at 1-loop in perturbation theory by including all the relevant relativistic contributions. This provides a description and understanding of what the dipole truly measures, in particular in relation to the gravitational redshift effect in Large Scale Structure. In order to develop this perturbative approach we have computed for the first time the relevant relativistic corrections to third order in perturbation theory, including the corresponding non-linear galaxy bias model. This perturbative approach agrees on a wide range of scales with good accuracy with previous numerical results based on geodesic light tracing in N-body simulations. Previous claims of gravitational redshift detection may have neglected several relativistic effects which are comparable with the amplitude of gravitational redshift around 10 Mpc/h scales and which complicate the gravitational redshift interpretation of the measurement.