FAST-PT II: an algorithm to calculate convolution integrals of general tensor quantities in cosmological perturbation theory
FAST-PT II: an algorithm to calculate convolution integrals of general tensor quantities in cosmological perturbation theory
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FAST-PT II：计算宇宙微扰理论中一般张量量卷积积分的算法
DOI：
10.1088/1475-7516/2017/02/030
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发表时间：
2016
影响因子：
6.4
通讯作者：
C. Hirata
中科院分区：
文献类型：
--
作者：
X. Fang;J. Blazek;J. McEwen;C. Hirata
宇宙微扰理论是预测弱非线性区域大尺度结构统计的有力工具，但即使在单圈阶，它也会导致计算昂贵的模式耦合积分。在这里，我们提出了一种快速算法，用于计算依赖于观察者方向的量的单回路功率谱，从而推广了FAST-PT框架（麦克尤恩等人，2016年），最初是为物质密度等标量开发的。该算法适用于任意输入功率谱，并大大减少了数值计算所需的时间。我们应用该算法的四个例子：在潮汐力矩模型中的星系的内在排列; Ostriker-Vishniac效应;由于重子流的二次CMB极化;和1-loop物质的功率谱在红移空间。实现该算法和这些应用的代码可在https://github.com/JoeMcEwen/FAST-PT公开获得。
Cosmological perturbation theory is a powerful tool to predict the statistics of large-scale structure in the weakly non-linear regime, but even at 1-loop order it results in computationally expensive mode-coupling integrals. Here we present a fast algorithm for computing 1-loop power spectra of quantities that depend on the observer's orientation, thereby generalizing the FAST-PT framework (McEwen et al., 2016) that was originally developed for scalars such as the matter density. This algorithm works for an arbitrary input power spectrum and substantially reduces the time required for numerical evaluation. We apply the algorithm to four examples: intrinsic alignments of galaxies in the tidal torque model; the Ostriker-Vishniac effect; the secondary CMB polarization due to baryon flows; and the 1-loop matter power spectrum in redshift space. Code implementing this algorithm and these applications is publicly available at https://github.com/JoeMcEwen/FAST-PT.
影响因子：
4.8
作者：
H. Hildebrandt;M. Viola;C. Heymans;S. Joudaki;K. Kuijken;C. Blake;T. Erben;B. Joachimi;D. Klaes
通讯作者：
H. Hildebrandt;M. Viola;C. Heymans;S. Joudaki;K. Kuijken;C. Blake;T. Erben;B. Joachimi;D. Klaes
影响因子：
6.4
作者：
Prism Collaboration Philippe Andr'e;C. Baccigalupi;A. Banday;D. Barbosa;B. Barreiro;J. Bartlett;N. Bart
通讯作者：
Prism Collaboration Philippe Andr'e;C. Baccigalupi;A. Banday;D. Barbosa;B. Barreiro;J. Bartlett;N. Bart
DESI 实验，Snowmass 2013 白皮书
DOI：
10.48550/arxiv.1308.0847
发表时间：
2013
期刊：
arXiv e-prints
影响因子：
--
作者：
Levi Michael
通讯作者：
Levi Michael