论文标题
有效场理论中的星系形状统计
Galaxy shape statistics in the effective field theory
论文作者
论文摘要
固有的星系比对对观察到的星系形状的统计量产生了重要贡献。弗拉（Vlah），chisari \＆schmidt使用一般扰动有效的田间理论（EFT）框架对星系中的一般偏差扩展，以三个维度的形状进行了描述。在这项工作中，我们提出了一种形式主义，该形式主义使用球形张量的特性将星系形状投射到扁平近似中的观察到的天空上，并在近代领先的顺序上计算两点函数以及领先的星系形状和数量计数的领先的三点函数。最终的表达式以方便的形式给出，以实现有效的数值实现。对于第四阶段调查的典型源红移分布，我们发现非线性的内在对齐贡献对星系形状相关性的贡献在Angular WaveNumbers $ L \ GTRSIM 100 $上变得相关。
Intrinsic galaxy alignments yield an important contribution to the observed statistics of galaxy shapes. The general bias expansion for galaxy sizes and shapes in three dimensions has been recently described by Vlah, Chisari \& Schmidt using the general perturbative effective field theory (EFT) framework, in analogy to the clustering of galaxies. In this work, we present a formalism that uses the properties of spherical tensors to project galaxy shapes onto the observed sky in the flat-sky approximation and compute the two-point functions at next-to-leading order as well as the leading-order three-point functions of galaxy shapes and number counts. The resulting expressions are given in forms that are convenient for efficient numerical implementation. For a source redshift distribution typical of Stage IV surveys, we find that that nonlinear intrinsic alignment contributions to galaxy shape correlations become relevant at angular wavenumbers $l \gtrsim 100$.
