Modern galaxy surveys focus on the galaxy power spectrum or 2-point correlation function to test and constrain cosmological models. Additional information comes from higher-order N-point functions, but their analysis is challenging. A simple solution is to compute the cross-power spectrum between the squared galaxy density and the galaxy density. Being simple to measure and to plot, this skew-spectrum shares many of the familiar useful properties of the standard galaxy power spectrum. We show that by computing multiple quadratic fields and correlating them with the density, all contributions to the tree-level redshift-space galaxy bispectrum can be captured with skew-spectra. Using synthetic datasets, we show that our measurement pipeline matches analytical predictions, and that their dependence on galaxy bias parameters and the logarithmic growth rate is as expected theoretically.

现代星系调查集中在星系功率谱或两点相关函数上，以测试和约束宇宙学模型。其他信息来自高阶N点函数，但其​​分析具有挑战性。一个简单的解决方案是计算平方星系密度和星系密度之间的互功率谱。该倾斜光谱易于测量和绘制，具有许多标准星系功率谱的熟悉有用的特性。我们表明，通过计算多个二次场并将它们与密度相关联，可以用偏谱来捕获对树级红移空间星系双谱的所有贡献。使用综合数据集，我们表明我们的测量渠道与分析预测相符，