The Projected Bispectrum of Large-scale Structure in the Universe

宇宙大尺度结构的投影双谱

• 批准号: 2437714
• 金额: --
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2437714
• 关键词: Projected; Bispectrum; Large; scale; Structure

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.

亚历克斯·米兰西斯（Alex Miranthis）将承担一个理论宇宙学项目，研究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）的科学利用，目的是限制早期宇宙的宇宙学模型。该项目的重点将是利用几个层析红移箱中的星系数据，从公开的星系调查中确定预计的双光谱，包括从斯隆数字巡天和暗能量巡天发布的最新数据。该方法将基于经过良好测试的普朗克卫星双谱估计器MODAL，由Fergusson和Shellard开发，相关的调查专业知识将从两个核心DES成员（MacCrann和Friedrich）那里获得。这项工作还将研究与CMB数据的相互关系，包括来自西蒙斯天文台的新数据。结果包括打破了宇宙学参数（特别是星系偏差参数）的简并性，并为暴胀的原始非高斯性提供了新的约束。