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Constraining the physics of the early Universe with CMB polarisation

用 CMB 偏振约束早期宇宙的物理现象

基本信息

批准号：
1964068
负责人：
金额：
--
依托单位：
University of Manchester
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-1964068
关键词：
Constraining physics early Universe CMB

项目摘要

Perhaps the most useful cosmological probe is the Cosmic Microwave Background (CMB). Thetemperature anisotropies have been measured extremely well by the Planck satellite and thishas established the current concordance cosmological model. However, the CMB has notbeen utilised fully yet: measurements of the CMB polarisation offer an opportunity to probethe physical processes that occurred in the very early Universe. The linear polarisation signalis decomposed into E-mode and B-mode contributions, where the detection of a B-modepolarization signal on large angular scales would demonstrate the existence of primordialgravitational waves. This would be indicative of inflation and provide a platform for exploringphysics at the Grand Unified Theory (GUT) energy scale. The detection of the B-mode signalis thus a major goal of future CMB observations, such as the ground-based Simons array andSimons Observatory, and the satellite LiteBIRD.The polarisation signal of interest is faint and as such optimal observation strategy,instrument design, and data-analysis is necessary. Spurious signals in the data that resemblethe B-mode signature can be generated by instrument and sky scanning imperfections, assuch these must be carefully accounted for. This project's aim is the optimisation of theinstrument design, scan strategy, and data analysis techniques for future CMB experimentsusing analytic techniques and computer simulations

也许最有用的宇宙探测器是宇宙微波背景（CMB）。普朗克卫星已经很好地测量了温度的各向异性，并建立了当前的调和宇宙学模型。然而，CMB还没有被充分利用：对CMB偏振的测量提供了一个探索宇宙早期发生的物理过程的机会。线性极化信号分解为e模和b模贡献，其中在大角尺度上探测到b模极化信号将证明原初引力波的存在。这将是暴胀的指示，并为在大统一理论（GUT）能量尺度上探索物理学提供了一个平台。因此，b模式信号的探测是未来宇宙微波背景观测的一个主要目标，比如地面的西蒙斯阵列和西蒙斯天文台，以及LiteBIRD卫星。感兴趣的极化信号是微弱的，因此最佳的观测策略、仪器设计和数据分析是必要的。数据中与b模式信号相似的虚假信号可能是由仪器和天空扫描缺陷产生的，因此必须仔细考虑这些缺陷。该项目的目的是优化仪器设计，扫描策略和数据分析技术，为未来的CMB实验使用分析技术和计算机模拟