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

AST-0307747研究人员将开发一种形式和物理模型来描述暗物质晕的子结构和形状。 解析模型假设宇宙中的质量被束缚在球形和光滑的晕中，但数值模拟现在有足够的分辨率来表明它们实际上是三轴的，而且相当明亮。 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。 它将支持模拟星系的光度函数及其演化，预测星系和气体在星系团中的分布，以及使用高阶统计来打破与两点统计测量相关的宇宙学参数之间的简并性。 广泛的应用范围使这项工作成为一个很好的统一框架，在这个框架内，研究生和本科生可以在大规模结构中了解主题。

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.***