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.

天体物理学的最后前沿之一是宇宙的最初十亿年，当时第一个星系和黑洞的形成产生了第一束星光，导致宇宙黎明。对无线电中 21 厘米中性氢线的观测有望首次打开了解这一时期 (z=6-27) 的窗口。 LOFAR、HERA 和 SKA 等干涉仪将绘制 21 厘米信号的波动图，而 EDGES 和 REACH 等单偶极子实验则希望探测全天空全球信号。这些新实验预计将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。该学生将参与一项合作，准备 SKA 观察并思考 REACH 分析，以开发用于 21 厘米实验的新统计和建模技术。该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（例如偶极子），以验证检测并在大范围内约束各向同性。该博士还将探索用于干涉观测的 21 厘米信号建模以及需要纳入的新物理学。