Collaborative Research: Substructure and the Halo Model of Large Scale Structure

合作研究：大型结构的子结构和光环模型

• 批准号: 0520647
• 负责人: Ravi Sheth
• 金额: $ 4.65万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0520647&HistoricalAwards=false
• 关键词: Collaborative; Research; Substructure; Halo; Model

AST-0307747ShethThe investigators will develop a formalism and physical models to describe the substructure and shapes of dark matter halos. Analytic models have assumed that the mass in the universe is bound up in halos which are both spherical and smooth, but numerical simulations now have sufficient resolution to show that they are actually triaxial and rather lumpy. This work will use gravitational lensing observations to constrain the small scale end of the cosmological mass power spectrum, to constrain halo profiles, and to interpret measurements of the cosmic shear field. It will support modeling the luminosity function of galaxies and its evolution, predicting the distribution of galaxies and gas in clusters, and the use of higher order statistics to break the degeneracy between cosmological parameters associated with measurements of two point statistics. The wide range of applications makes this work a good unified framework within which to introduce graduate and undergraduate students to topics in large-scale structure.***

研究人员将开发一种形式主义和物理模型来描述暗物质晕的亚结构和形状。分析模型假设宇宙中的质量被束缚在光晕中，这些光晕既是球形的，又是光滑的，但现在的数值模拟已经有了足够的分辨率，可以表明它们实际上是三轴的，而且相当粗糙。这项工作将使用引力透镜观测来约束宇宙质量功率谱的小尺度端，约束晕轮廓，并解释宇宙剪切场的测量结果。它将支持对星系的光度函数及其演化进行建模，预测星系和气体在星系团中的分布，并使用更高阶统计量来打破与两点统计测量相关的宇宙学参数之间的简并。广泛的应用使这项工作成为一个很好的统一框架，在其中向研究生和本科生介绍大规模结构的主题。*