Ellipticity correlations between galaxies, reconstructions of the cosmic density field, tidal shear correlations in the cosmic structure

星系之间的椭圆度相关性、宇宙密度场的重建、宇宙结构中的潮汐剪切相关性

• 批准号: 216538304
• 负责人: Professor Dr. Björn Malte Schäfer
• 金额: --
• 依托单位: Zentrum für Astronomie (ZAH)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/216538304?language=en
• 关键词: Ellipticity; correlations; between; galaxies; reconstructions

Ellipticity correlations between galaxies which are caused by their coupled angular momenta are a fascinating research topic. On the theoretical side they touch our understanding of cosmic structure formation and the tidal forces in the cosmic large-scale structure, which induce angular momentum into protogalaxies, and on the practical side we require an understanding of these ellipticity correlations for our interpretation of the weak cosmic lensing effect, in particular for the estimation of cosmological parameters. In this proposal I would like to address two questions: How well do ellipticities trace the tidal shear field and how does the tidal shear correlation functions look like in the principal axis frame of the protohaloes, which is the only frame of physical relevance.

星系间的椭圆度关联是一个引人入胜的研究课题，它是由星系间的耦合角动量引起的。在理论方面，它们触及了我们对宇宙结构形成和宇宙大尺度结构中潮汐作用力的理解，它们将角动量引入原星系，而在实践方面，我们需要了解这些椭圆度关联，以便我们解释弱宇宙透镜效应，特别是估计宇宙学参数。在这项提议中，我想解决两个问题：椭圆追踪潮汐切变场的效果如何，以及潮汐切变相关函数在原晕主轴坐标系中的表现如何，这是唯一的物理关联框架。