Dark matter: from the early Universe to the Milky Way

暗物质：从早期宇宙到银河系

• 批准号: 2430492
• 金额: --
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2430492
• 关键词: Dark; matter; early; Universe; Milky

There are various well-motivated dark matter candidates, including WIMPs, axions and Primordial Black Holes (PBHs). PBHs are black holes formed in the early Universe, for instance from the collapse of large density perturbations generated during inflation. To detect dark matter, we need to understand how it is distributed, which depends on the formation and evolution of the first dark matter structures. The discovery of gravitational waves from mergers of ~10 Solar mass black hole binaries has led to increased interest in PBHs as a dark matter candidate. There are various constraints on the abundance of PBHs, for instance from gravitational lensing and their dynamical effects. To date the calculations of these constraints have made various simplifying assumptions. For instance, that the PBHs are smoothly distributed, like particle dark matter. This project will examine how more realistic modelling of the PBH population affects these constraints, starting with the effects of PBH clustering on stellar microlensing constraints.

有各种动机良好的暗物质候选者，包括WIMP，轴子和原始黑洞（PBH）。PBH是在早期宇宙中形成的黑洞，例如在膨胀过程中产生的大密度扰动的坍缩。为了探测暗物质，我们需要了解它是如何分布的，这取决于第一个暗物质结构的形成和演化。从10个太阳质量的黑洞双星合并中发现的引力波引起了人们对PBH作为暗物质候选者的兴趣。PBH的丰度受到各种限制，例如来自引力透镜及其动力学效应。到目前为止，这些约束的计算已经做出了各种简化假设。例如，PBH是平滑分布的，就像粒子暗物质一样。这个项目将研究如何更现实的建模PBH人口影响这些限制，从PBH集群恒星微透镜约束的影响。