Astrophysics and cosmology from the epoch of reionization with SKA and REACH

SKA 和 REACH 再电离时代的天体物理学和宇宙学

• 批准号: 2614388
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2614388
• 关键词: Astrophysics; cosmology; epoch; reionization; SKA

One of the last frontiers of astrophysics is the first billion years of the Universe, when the formation of the first galaxies and black holes produced the first star light leading to a Cosmic Dawn. Observations of the 21 cm line of neutral hydrogen in the radio promises to open a window onto this period (z=6-27) for the first time. Interferometers like LOFAR, HERA, and SKA will map fluctuations in the 21cm signal, while single dipole experiments like EDGES and REACH hope to detect the all sky global signal. These new experiments are expected to provide new insights into astrophysics and cosmology and are already starting to provide interesting data. The student will be part of a collaboration preparing for SKA observations and thinking about the analysis of REACH to develop new statistical and modelling techniques for 21cm experiments. The PhD will explore new methods for analysing global signal data to constrain low order multipoles, such as the dipole, to validate detection and constrain isotropy on large scales. The PhD will also explore modelling of the the 21cm signal for interferometric observations and new physics that needs to be included.

天体物理学最后的前沿之一是宇宙的第一个十亿年，当第一个星系和黑洞的形成产生了第一个星星光导致宇宙的黎明。对射电中21厘米中性氢谱线的观测有望首次为这个周期（z=6-27）打开一扇窗户。像LOFAR、HERA和SKA这样的干涉仪将映射21厘米信号的波动，而像EDGES和REACH这样的单偶极实验则希望探测全天的全球信号。这些新的实验有望为天体物理学和宇宙学提供新的见解，并且已经开始提供有趣的数据。学生将参与合作，为SKA观测做准备，并思考REACH的分析，为21 cm实验开发新的统计和建模技术。博士将探索分析全球信号数据的新方法，以约束低阶多极子，如偶极子，以验证检测和约束大尺度上的各向同性。博士还将探索21厘米信号的干涉观测和新的物理模型，需要包括在内。