Consistent modeling of velocity statistics and redshift-space distortions in one-loop perturbation theory
Consistent modeling of velocity statistics and redshift-space distortions in one-loop perturbation theory
复制标题
DOI：
10.1088/1475-7516/2020/07/062
复制
发表时间：
2020-05
影响因子：
6.4
通讯作者：
Shi-Fan Chen;Z. Vlah;M. White
中科院分区：
文献类型：
--
作者：
Shi-Fan Chen;Z. Vlah;M. White
宇宙密度场的有偏示踪粒子的特殊速度包含了大尺度结构生长的重要信息，并在观测到的星系团中产生了各向异性。利用N体数据，我们证明了在包含前三个成对速度矩的情况下，对于大多数视线角μ，晕红移空间功率谱的速度展开式在微扰尺度下收敛于π-水平，并且第三个速度矩可以很好地近似为反项贡献.我们计算这些成对的速度统计在傅立叶空间中使用欧拉和拉格朗日单回路微扰理论，使用三次偏置方案和一套完整的计数项和随机贡献。我们比较的模型，并表明，我们的模型适合真实的空间速度统计和红移空间功率谱的晕和模拟样本的星系在次百分比水平上的微扰尺度使用一致的参数集，使他们吸引人的选择即将到来的时代的光谱，特殊的速度和kSZ调查。
The peculiar velocities of biased tracers of the cosmic density field contain important information about the growth of large scale structure and generate anisotropy in the observed clustering of galaxies. Using N-body data, we show that velocity expansions for halo redshift-space power spectra are converged at the percent-level at perturbative scales for most line-of-sight angles μ when the first three pairwise velocity moments are included, and that the third moment is well-approximated by a counterterm-like contribution. We compute these pairwise-velocity statistics in Fourier space using both Eulerian and Lagrangian one-loop perturbation theory using a cubic bias scheme and a complete set of counterterms and stochastic contributions. We compare the models and show that our models fit both real-space velocity statistics and redshift-space power spectra for both halos and a mock sample of galaxies at sub-percent level on perturbative scales using consistent sets of parameters, making them appealing choices for the upcoming era of spectroscopic, peculiar-velocity and kSZ surveys.