arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.09730astro-ph.CO
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红移巡天的平面平行近似之外

Beyond the plane-parallel approximation for redshift surveys

Emanuele Castorina, Martin White

摘要:

在宇宙学的红移巡天中,红移空间的扭曲使观测者的位置得到了特权,破坏了基础理论的平移对称性。这种违反统计均匀性的后果,集群观测建模,导致什么是经常被称为“广角效应”。我们研究这些影响分析,计算他们的签名在配置和傅立叶空间中的多极子的集群。我们考虑到物理广角的贡献,以及由星系选择函数产生的条款。类似的考虑也影响功率谱估计器的构造方式。我们以分析的方式量化了进入的偏差,并澄清了我们测量的内容与基础理论模型之间的关系。还讨论了角窗函数的存在。出于这种分析,我们提出了新的估计的三维笛卡尔功率谱和双谱多极球傅里叶-贝塞尔系数方面写的。我们展示了后者如何有几个有趣的属性,特别是允许角和径向模式之间的明确分离。

英文摘要:

Redshift space distortions privilege the location of the observer in cosmological redshift surveys, breaking the translational symmetry of the underlying theory. This violation of statistical homogeneity has consequences for the modeling of clustering observables, leading to what are frequently called `wide angle effects'. We study these effects analytically, computing their signature in the clustering of the multipoles in configuration and Fourier space. We take into account both physical wide angle contributions as well as the terms generated by the galaxy selection function. Similar considerations also affect the way power spectrum estimators are constructed. We quantify, in an analytical way the biases which enter and clarify the relation between what we measure and the underlying theoretical modeling. The presence of an angular window function is also discussed. Motivated by this analysis we present new estimators for the three dimensional Cartesian power spectrum and bispectrum multipoles written in terms of spherical Fourier-Bessel coefficients. We show how the latter have several interesting properties, allowing in particular a clear separation between angular and radial modes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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