New tests of physics with constrained large-scale structure simulations

通过约束大规模结构模拟进行新的物理测试

• 批准号: 2753834
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2753834
• 关键词: New; tests; physics; constrained; large

Typical simulations of galaxy formation adopt random phases for the primordial density perturbations and therefore produce structures with specified statistical properties but arbitrary positions in space. In contrast, "constrained" simulations match the matter distribution of the actual local Universe, allowing a one-to-one mapping between objects in the simulation and observed galaxies and structures. The student will leverage a suite of constrained N-body simulations called CsiBORG (Bartlett et al. 2021) to devise and carry out novel investigations of astrophysical models. This may include testing semi-analytic galaxy formation models, searching for correlations between the evolution of dark matter and visible matter over cosmic time, developing or exploiting a new method for identifying voids in the local Universe (Desmond et al. 2022), and/or quantifying potential bias in the locally measured expansion rate of the Universe due to nearby structure. There is also scope for the student to run their own constrained simulations, for example with the addition of hydrodynamics and radiative transfer to explore the reionization history of the local Universe, and/or to constrain the distribution of neutral/molecular hydrogen in the local Universe.

星系形成的典型模拟采用了原始密度扰动的随机阶段，因此产生具有指定统计特性但在空间中任意位置的结构。相反，“约束”模拟与实际局部宇宙的物质分布相匹配，从而允许在模拟和观察到的星系和结构中对象之间进行一对一的映射。该学生将利用一套被称为Csiborg（Bartlett etal。2021）的受约束的N体模拟套件来设计和对天体物理模型进行新的研究。这可能包括测试半分析星系形成模型，在宇宙时间内寻找暗物质的演变与可见物质之间的相关性，开发或利用一种新方法来识别本地宇宙中的空隙（Desmond等，2022），以及/或量化在近乎临近的大学结构的局部测量潜在偏见中的潜在偏见。学生还可以进行自己的限制模拟，例如增加流体动力学和辐射转移以探索当地宇宙的电离历史和/或限制本地宇宙中中性/分子氢的分布。