Super-sample tidal modes on the celestial sphere
Super-sample tidal modes on the celestial sphere
复制标题
天球上潮汐模式的超级样本
DOI：
10.1103/physrevd.100.103515
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发表时间：
2019
影响因子：
5
通讯作者：
Shiraishi Maresuke
中科院分区：
文献类型：
--
作者：
Akitsu Kazuyuki;Sugiyama Naonori S.;Shiraishi Maresuke
超样本潮汐效应携带着我们无法直接测量的长波长波动信息。它产生于短波长和长波长扰动之间的模式耦合超出了有限区域的星系调查，违反了观测到的星系功率谱的统计各向同性。在本文中，我们提出了使用双极球谐函数（BipoSH）分解形式主义的统计各向异性功率谱的特征。使用的BipoSH形式主义，我们进行了全面的研究的超样本潮汐测量的其他宇宙学失真，如红移空间失真（RSD）和Alcock-Paczyorski（AP）的影响，通过Fisher信息矩阵形式主义。我们发现，BipoSH方法可以打破超样本潮汐、RSD和AP效应之间的参数简并，表明超样本潮汐对RSD和AP效应的测量影响很小。我们还表明，超样本潮汐是可检测的准确性比thepreduction不损害其他各向异性的测量精度假设一个SPHEREx的星系调查。
The super-sample tidal effect carries information on long-wavelength fluctuations that we cannot measure directly. It arises from the mode-coupling between short-wavelength and long-wavelength perturbations beyond a finite region of a galaxy survey and violates statistical isotropy of observed galaxy power spectra. In this paper, we propose the use of bipolar spherical harmonic (BipoSH) decomposition formalism to characterize statistically anisotropic power spectra. Using the BipoSH formalism, we perform a comprehensive study of the effect of the super-sample tides on measurements of other cosmological distortions such as the redshift-space distortion (RSD) and Alcock-Paczyński (AP) effects by means of the Fisher information matrix formalism. We find that the BipoSH formalism can break parameter degeneracies among the super-sample tidal, RSD and AP effects, indicating that the super-sample tides have little impact on the measurements of the RSD and AP effects. We also show that the super-sample tides are detectable with an accuracy better than theprediction without impairing the accuracy of measurements of other anisotropies assuming a SPHEREx-like galaxy survey.