Non-Standard Mechanisms for Cosmic Microwave Background B-mode Production

宇宙微波背景 B 模式产生的非标准机制

• 批准号: 2605411
• 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-2605411
• 关键词: Non; Standard; Mechanisms; Cosmic; Microwave

The search for the primordial B-mode polarization signal in the cosmic microwave back- ground (CMB), sourced by gravitational waves in the early universe, is a primary science goal of many contemporary and future experiments. However, a number of cosmological effects and imperfections in instrument design may also source B-modes that may contaminate the primordial signal. In this project we will study these systematic instrument imperfections, and a cosmological effect, that may source B-modes, known as cosmological birefringence CB. The CB effect involves a beyond standard model coupling between a pseudo-scalar field (such as the axion) and the photon that can generate either a uniform, or a direction dependent rotation of the linear polarization angle of CMB photons.

在宇宙微波背景（CMB）中寻找由早期宇宙引力波来源的原始b模偏振信号，是许多当代和未来实验的主要科学目标。然而，一些宇宙学效应和仪器设计上的缺陷也可能产生b模，从而污染原始信号。在这个项目中，我们将研究这些系统仪器的缺陷，以及一种宇宙学效应，它可能是b模式的来源，被称为宇宙双折射CB。CB效应涉及伪标量场（如轴子）和光子之间的超标准模型耦合，该耦合可以产生CMB光子线性偏振角的均匀旋转或方向依赖旋转。