论文标题
一环扰动理论中速度统计和红移空间变形的一致建模
Consistent Modeling of Velocity Statistics and Redshift-Space Distortions in One-Loop Perturbation Theory
论文作者
论文摘要
宇宙密度场的有偏见示踪剂的特殊速度包含有关大规模结构生长的重要信息，并在观察到的星系聚类中产生各向异性。使用N体数据，我们表明，当包括前三个成对的速度速度矩时，大多数偏视角度的速度尺度的速度膨胀在扰动尺度的百分比级别以扰动尺度收缩，并且第三次瞬间是通过违反类似的贡献对第三次进行良好的影响。我们使用欧拉和拉格朗日的一环扰动理论，使用立方体偏置方案以及一组完整的对抗和随机贡献来计算傅立叶空间中的这些成对速度统计。我们比较了模型，并表明我们的模型使用一致的参数集合在扰动尺度上，均适合晕圈和红移空间的电源光谱，并使用一致的参数样本，使它们对即将到来的Spectrospic ERA具有吸引力的选择，以实现光谱时代的时代，Peculiar-evelocity和peculiar-velocity和ksz surveys和Ksz surve。
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.
