Accurate and precise statistical methods for weak gravitational lensing

弱引力透镜的精确统计方法

• 批准号: 2471324
• 金额: --
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2471324
• 关键词: Accurate; precise; statistical; methods; weak

Gravitational lensing - the deflection of light from distant luminous sources by intervening matter - is a powerful technique for understanding our Universe. Coherent distortions in the shapes of galaxies can be used to infer the properties of the intervening dark matter, in particular its spatial distribution (i.e. how clumped or how smooth it is) and its evolution throughout cosmic history. Lensing is sensitive to the geometry of space-time and hence to the constituent components of the Universe. The dominant component is the so-called "dark energy", a poorly-understood source of energy-density which appears to mimic a cosmological constant term in the Einstein field equations. Gaining an understanding into the properties of dark energy is fundamental to our understanding of physics and is one of the main science drivers for upcoming cosmology surveys such as the Euclid space telescope. Having accurate and precise techniques for measuring the power spectrum of fluctuations in the lensing strength over the sky will be crucial for measuring dark energy properties with Euclid. The student will develop statistical methods inspired by analyses of the cosmic microwave background and apply them to realistic synthetic maps of cosmic shear. Edinburgh leads the weak lensing analysis of Euclid and hosts the UK Science Ground Segment Science Data Centre. There will be the opportunity to work within the Euclid weak lensing team, giving the student access to a state-of-the-art cosmology survey. There will also be opportunities to apply the methods to current data.

引力镜头 - 通过干预物质从远处发光来源偏转 - 是一种理解我们宇宙的强大技术。星系形状的相干扭曲可用于推断中间暗物质的特性，尤其是其空间分布（即块状或光滑的样子）及其在整个宇宙历史中的演变。镜头对时空的几何形状敏感，因此对宇宙的组成部分敏感。主要的成分是所谓的“暗能量”，这是一种能量密度不佳的来源，似乎模仿了爱因斯坦磁场方程中的宇宙学恒定项。了解深色能源的特性是我们对物理学的理解至关重要的，并且是即将进行的宇宙学调查（例如欧几里得太空望远镜）的主要科学驱动因素之一。具有准确，精确的技术，用于测量天空镜头强度波动的功率谱，对于用欧几里得测量暗能能特性至关重要。该学生将开发受宇宙微波背景分析启发的统计方法，并将其应用于宇宙剪切的逼真的合成图。爱丁堡领导着欧几里得的弱透镜分析，并主持了英国科学地面科学数据中心。将有机会在Euclid弱镜头团队中工作，使学生可以访问最先进的宇宙学调查。还将有机会将方法应用于当前数据。