Weak gravitational lensing with the Euclid mission

这个项目解决了STFC的挑战A3，“宇宙是如何演变的，暗物质和暗能量扮演什么角色？”“，C4，“暗物质和暗能量的本质是什么？和A7，“什么是重力的真正本质？".该项目旨在为分析欧空局和英国资助的欧几里得使命飞行任务的弱透镜数据，特别是弱透镜数据做准备。它特别关注系统误差在分析中的作用，并着眼于望远镜建模误差如何传播到宇宙学分析中可能的偏差。它使用最先进的方法来望远镜建模和传播的错误和偏见，并将是一个关键的“端到端”的分析这个关键的宇宙学探测。工作将进行合作，并作为欧几里得财团的一部分。弱引力透镜的测量是测试标准宇宙学模型和宇宙尺度上的广义相对论的准确性的关键方法之一。欧洲航天局的欧几里得使命将在对整个天空的三分之一进行精确测量方面开辟新的天地。但要做到这一点，我们必须首先精确地模拟欧几里得望远镜的扭曲效应，在牛津大学，我们一直在努力模拟望远镜并校正透镜测量。欧几里得将于2022年发射，调查将需要五年时间才能完成。菲尔博士学生将从事建模和剪切测量工作，包括分析第一次在轨校准测量，并应能够获得第一批令人兴奋的新测量数据。这项工作将涉及使用科学编程和模拟来测试和改进我们的望远镜及其探测器的物理模型，加上观测数据的统计分析，学生应该在使命的早期数据的第一次分析中发挥作用。

This project addresses the STFC challenges A3, "how is the universe evolving and what roles do dark matter and dark energy play?", C4, "what is the nature of dark matter and dark energy?" and A7, "what is the true nature of gravity?". The project aims to prepare for the analysis of weak lensing data from the ESA and UKSA-funded Euclid mission, in particular the weak lensing data. It particularly focusses on the role that systematic errors will play in the analysis, and looks at how telescope modelling errors would propagate into possible biases in the cosmological analysis. It uses state-of-the-art approaches to telescope modelling and propagation of errors and biases, and will be a key "end-to-end" analysis of this key cosmology probe.Work will be carried out in collaboration with and as part of the Euclid Consortium.Measurements of weak gravitational lensing are one of the key ways of testing the standard cosmological model and the accuracy of general relativity on cosmological scales. The European Space Agency's Euclid mission will break new ground in making accurate measurements over about one-third of the entire sky. But to achieve that, we must first accurately model the distorting effect of the Euclid telescope, and at Oxford we have been leading the effort to model the telescope and correct the lensing measurements. Euclid is due launch in 2022 and the survey will take five years to complete. The D.Phil student will work on the modelling and shear measurement, including analysis of the first in-orbit calibration measurements, and should have access to the first of the exciting new survey data to be obtained. The work will involve using scientific programming and simulations to test and improve our physical models of the telescope and its detectors, plus statistical analysis of observational data, and the student should have a role in the first analyses of the early data from the mission.