The Projected Bispectrum of Large-scale Structure in the Universe

Alex Miranthis将开展一个理论宇宙学项目，对从星系调查中提取的高阶相关函数（特别是双谱或三点相关器）进行科学利用，目的是约束早期宇宙的宇宙学模型。该项目的重点将是从公开的星系调查中确定投影双谱，包括斯隆数字巡天和暗能量调查的最新数据，使用几个层析红移箱中的星系数据。该方法将以Fergusson和Shellard开发的久经考验的普朗克卫星双谱估计器MODAL为基础，DES的两名核心成员（MacCrann和Friedrich）将提供相关的调查专业知识。这项工作还将研究与CMB数据的互相关，包括西蒙斯天文台的新数据。其结果包括打破宇宙学参数（特别是星系偏置参数）的简并，并从暴胀中提供对原始非高斯性的新约束。

Alex Miranthis will undertake a project in theoretical cosmology on the science exploitation of higher-order correlation functions (notably the bispectrum or three-point correlator) extracted from galaxy surveys, with the objective of constraining cosmological models of the early Universe. The focus of the project will be determining the projected bispectrum from publicly-available galaxy surveys, including the most recent data releases from the Sloan Digital Sky Survey and the Dark Energy Survey, using galaxy data in several tomographic redshift bins. The methodology will be based around the well-tested Planck satellite bispectrum estimator MODAL, developed by Fergusson and Shellard, and relevant survey expertise will be available from two core DES members (MacCrann and Friedrich). This work will also study cross-correlations with CMB data, including new data from the Simons Observatory. The outcomes include breaking degeneracies on cosmological parameters (notably galaxy bias parameters) and providing new constraints on primordial non-Gaussianity from inflation.