Non-linear relativistic effects on cosmological perturbations

宇宙扰动的非线性相对论效应

• 批准号: 1998600
• 金额: --
• 依托单位: University of Portsmouth
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1998600
• 关键词: Non; linear; relativistic; effects; cosmological

The growth of cosmological perturbations is usually studied either through perturbation theory or via non-linear simulations. In the former approach, the full effects of general relativity are included, but the calculations are limited to large scales where the perturbations are small. Conversely, simulations are able to follow the evolution on small scales, but the treatment of gravity is usually approximated as Newtonian. The focus of this project is to understand how a fully relativistic treatment affects the non-linear evolution of structure, and how this will impact our interpretation of the next generation of large scale structure data, such as the Square Kilometre Array (SKA). The student will be building our recent advances in this area, including a consistent second order relativistic code and our understanding of how Newtonian simulations can be interpreted in a relativistic context. They will also work to determine how line-of sight effects, like gravitational lensing, can impact the observations on the largest scales.

通常通过微扰理论或通过非线性模拟来研究宇宙扰动的增长。在前一种方法中，包括了广义相对论的全部影响，但计算仅限于扰动较小的大尺度。相反，模拟能够跟踪小尺度上的演化，但重力的处理通常被近似为牛顿。这个项目的重点是了解完全相对论处理如何影响结构的非线性演化，以及这将如何影响我们对下一代大规模结构数据的解释，例如平方公里阵列(SKA)。学生将建立我们在这一领域的最新进展，包括一致的二阶相对论代码，以及我们对如何在相对论背景下解释牛顿模拟的理解。他们还将致力于确定视线效应，如引力透镜效应，如何影响最大尺度上的观测。