Luminous Red Galaxies in the Sloan Digital Sky Survey: Baryon Acoustic Oscillations and the Composition of the Universe

斯隆数字巡天中的发光红色星系：重子声振荡和宇宙的组成

• 批准号: 0707725
• 负责人: Romeel Dave
• 金额: $ 27.48万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0707725&HistoricalAwards=false
• 关键词: Luminous; Red; Galaxies; Sloan; Digital

AST-0707725EisensteinThis project will use a specially-targeted sample of luminous early-type galaxies in the Sloan Digital Sky Survey (SDSS) to probe the large-scale correlations of galaxies with unprecedented accuracy. This will refine existing measurements of the baryon acoustic oscillations (BAO) and the matter density of the Universe. Sound waves that propagate in the first million years after the Big Bang imprint distinctive features into the anisotropies of the cosmic microwave background (CMB) and the clustering of matter today. These BAO create a sharp feature in the correlation of galaxies whose scale can be combined with information from CMB anisotropy data to place strong constraints on the curvature of the Universe and on dark energy. The SDSS Luminous Red Galaxy (LRG) sample is the best dataset by a wide margin for studying the BAO and other aspects of large-scale structure. Coupling these data with new theoretical insights should lead to significant improvements, perhaps halving the error bars on earlier results.The acceleration of the expansion rate of the Universe is one of the central problems in modern cosmology and poses a deep challenge to physics. Both the observational and the theoretical parts of this work will have a direct impact on the design of future galaxy redshift surveys, and on the portfolio of dark energy experiments. The principal investigator will also continue to engage several students, both graduate and undergraduate, in this research.

AST-0707725 Eisenstein该项目将使用斯隆数字巡天（SDSS）中的一个特殊目标的明亮早期星系样本，以前所未有的精度探测星系的大尺度相关性。 这将完善现有的重子声学振荡（BAO）和宇宙物质密度的测量。 在大爆炸后的第一个百万年中传播的声波给宇宙微波背景（CMB）的各向异性和今天的物质聚集留下了独特的特征。 这些BAO在星系的相关性中创造了一个尖锐的特征，其尺度可以与CMB各向异性数据的信息相结合，对宇宙的曲率和暗能量施加强有力的约束。 SDSS亮红星系（LRG）样本是研究BAO和大尺度结构其他方面的最佳数据集。 将这些数据与新的理论见解结合起来，应该会带来显著的改进，也许会将早期结果的误差线减半。宇宙膨胀率的加速是现代宇宙学的核心问题之一，也是对物理学的深刻挑战。 这项工作的观测和理论部分将对未来星系红移调查的设计以及暗能量实验的组合产生直接影响。 主要研究者还将继续让几名学生参与这项研究，包括研究生和本科生。