Gravitational lensing as a key probe to understand the cosmic acceleration

引力透镜作为了解宇宙加速的关键探测器

• 批准号: 1900955
• 金额: --
• 依托单位: Durham University
• 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-1900955
• 关键词: Gravitational; lensing; key; probe; understand

In the next decade, large galaxy surveys such as Euclid, LSST and DESI will start to collect data, allowing key cosmological parameters to be determined with much higher precision and different cosmological models to be distinguished from each other. These will also shed light on the challenging fundamental question about the nature of the accelerated cosmic expansion - whether it is due to some dark energy component or a modification to gravity. The first two of these surveys will provide excellent data of weak gravitational lensing, which is one of the key probes to test models for the cosmic acceleration. This project will mainly explore the predictions of lensing observables by the different theoretical models, and how and how well they can be used to constrain models. It will rely on large high-resolution numerical simulations for model predictions and to improve the understanding of the physics underlying key observables. A substantial part of it will be devoted to developing novel methods that are best tailored for testing models given the expected data. There is also the opportunity to combine lensing probes with probes of galaxy clustering (from Euclid and DESI) to improve model constraints.

在未来十年，大型星系巡天，如欧几里得、LSST和DESI将开始收集数据，从而能够以更高的精度确定关键的宇宙学参数，并区分不同的宇宙学模型。这些也将揭示关于加速宇宙膨胀的性质的具有挑战性的基本问题-无论它是由于一些暗能量成分还是引力的修改。其中前两次调查将提供弱引力透镜的优秀数据，这是测试宇宙加速模型的关键探测器之一。本计画将主要探讨不同理论模型对透镜观测量的预测，以及如何以及如何将它们用来约束模型。它将依赖于大型高分辨率数值模拟进行模型预测，并提高对关键观测量物理基础的理解。其中很大一部分将致力于开发新的方法，这些方法最适合于在给定预期数据的情况下测试模型。还有机会将联合收割机与星系团探测器（来自欧几里得和DESI）结合起来，以改善模型的约束。