Solving cosmological questions in strong gravity

解决强引力下的宇宙学问题

• 批准号: ST/V003240/1
• 负责人: Katy Clough
• 金额: $ 74.5万
• 依托单位: Queen Mary University of London
• 依托单位国家: 英国
• 项目类别: Fellowship
• 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=ST%2FV003240%2F1
• 关键词: Solving; cosmological; questions; strong; gravity

My work seeks to answer two questions that go to the heart of cosmology - understanding what the Universe is made of, and where it came from.Firstly, what is dark matter? Dark matter is one of the main components of our Universe, but so far it has only been detected via its gravitational effect on stars and galaxies. I will identify how key properties of the particles that make up the dark matter, such as mass and spin, affect its clustering around black holes. I will then investigate how these dark matter environments affect gravitational wave and electromagnetic signals, linking these "multimessenger" observations to particle physics.Secondly, how did the Universe begin? I will explore the behaviour of our universe at the earliest times, when even small imperfections may blow up in a chaotic way. The aim is to understand how our universe emerged from a Big Bang to the state of uniform expansion that we observe - did non-uniform regions become synchronised? Can new types of matter act as a "cosmological smoother"? How did we escape the fate of a contracting universe?To answer these questions, I am using "numerical relativity" computational techniques. These tools were developed to allow the LIGO/Virgo network of gravitational wave detectors to interpret the signals they see from merging black holes and neutron stars, but are now attracting attention in other areas of theoretical physics. I am pioneering their application to cosmological questions, a nascent field which harnesses the power of modern supercomputing to answer long-standing questions about our Universe.

我的工作旨在回答两个宇宙学的核心问题--理解宇宙是由什么组成的，它从哪里来。首先，什么是暗物质？暗物质是我们宇宙的主要组成部分之一，但到目前为止，它只能通过其对恒星和星系的引力作用来检测。我将确定构成暗物质的粒子的关键属性，如质量和自旋，如何影响其在黑洞周围的聚集。然后，我将研究这些暗物质环境如何影响引力波和电磁信号，将这些“多信使”观测与粒子物理学联系起来。第二，宇宙是如何开始的？我将探索我们宇宙最早期的行为，那时即使是很小的缺陷也可能以混乱的方式爆炸。其目的是了解我们的宇宙是如何从大爆炸中出现的，达到我们所观察到的均匀膨胀状态的--不均匀的区域是否同步了？新型物质能否充当“宇宙平滑器”？我们是如何逃脱宇宙收缩的命运的？为了回答这些问题，我正在使用“数值相对论”计算技术。这些工具的开发是为了让LIGO/Virgo引力波探测器网络能够解释他们从合并黑洞和中子星中看到的信号，但现在正在吸引理论物理学其他领域的注意力。我正在开创他们在宇宙学问题上的应用，这是一个新兴的领域，利用现代超级计算的力量来回答关于我们宇宙的长期问题。

项目成果

Where is the ringdown: Reconstructing quasinormal modes from dispersive waves

振铃在哪里：从色散波重建准正规模

• DOI: 10.1103/physrevd.106.104002
• 发表时间: 2022
• 期刊: Physical Review D
• 影响因子: 5
• 作者: Aurrekoetxea J

CTTK: a new method to solve the initial data constraints in numerical relativity

CTTK：解决数值相对论中初始数据约束的新方法

• DOI: 10.1088/1361-6382/acb883
• 发表时间: 2023
• 期刊: Classical and Quantum Gravity
• 影响因子: 3.5
• 作者: Aurrekoetxea J

Cosmology with the Laser Interferometer Space Antenna

激光干涉仪空间天线的宇宙学

• DOI: 10.48550/arxiv.2204.05434
• 发表时间: 2022
• 期刊: arXiv e-prints
• 作者: Auclair Pierre

Tunneling-induced cosmic bounce in the presence of anisotropies

存在各向异性时隧道引起的宇宙弹跳

• DOI: 10.1103/physrevd.108.103515
• 发表时间: 2023
• 期刊: Physical Review D
• 影响因子: 5
• 作者: Alexandre J

Oscillon formation during inflationary preheating with general relativity

广义相对论暴胀预热过程中振荡的形成

• DOI: 10.1103/physrevd.108.023501
• 发表时间: 2023
• 期刊: Physical Review D
• 影响因子: 5
• 作者: Aurrekoetxea J