Weak gravitational lensing with the Euclid mission

该项目解决了STFC的挑战A3，“宇宙是如何进化的，暗物质和暗能量扮演着什么角色？”，C4，“暗物质和暗能量的本质是什么？”以及A7，“引力的真实本质是什么？”。该项目旨在为欧洲航天局和英国航天局资助的欧几里得任务的弱透镜数据分析做准备，特别是弱透镜数据。它特别关注系统误差在分析中所扮演的角色，并研究望远镜建模误差如何传播到宇宙学分析中的可能偏差。它使用最先进的方法来进行望远镜建模和误差和偏差的传播，并将成为这个关键宇宙探测器的关键“端到端”分析。工作将与欧几里得联盟合作并作为欧几里得联盟的一部分进行。弱引力透镜的测量是检验标准宇宙学模型和广义相对论在宇宙尺度上准确性的关键方法之一。欧洲航天局的欧几里得任务将在对整个天空的三分之一进行精确测量方面取得新的突破。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，我们一直在努力模拟望远镜并修正透镜测量。欧几里得计划于2022年发射，这项调查将需要5年时间才能完成。菲尔博士的学生将进行建模和剪切测量，包括对第一次在轨校准测量的分析，并将获得第一批令人兴奋的新调查数据。这项工作将包括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，以及对观测数据的统计分析，学生应该在对任务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.