The impact of cosmic strings on the gravitational wave signal measured by LIGO and LISA

宇宙弦对LIGO和LISA测量的引力波信号的影响

• 批准号: 2602947
• 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: 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-2602947
• 关键词: impact; cosmic; strings; gravitational; wave

Cosmic strings are a type of topological defect that can be produced in the early Universe, and are one of the most likely sources of cosmological gravitational waves. They produce gravitational waves though the presence of cusps and kinks on string loops, giving rise to both a transient signal and a stochastic background. Due to modelling uncertainty in the loops, the precise nature of the expected signal is yet to be determined. In this project you will study in detail the statistics of string cusps and kinks, and develop a model of the loop population. The current LIGO search technique involves comparing candidate events to a set of templates. Given the uncertainty in the signal, you will develop model independent methods to search for strings in the LIGO data, and also provide estimates for the LISA experiment.

宇宙弦是一种可以在早期宇宙中产生的拓扑缺陷，并且是宇宙学引力波的最可能来源之一。它们产生引力波，尽管尖齿和扭结在弦上环上的存在，从而产生了瞬态信号和随机背景。由于循环的建模不确定性，尚未确定预期信号的确切性质。在此项目中，您将详细研究弦尖和扭结的统计数据，并开发循环人群的模型。当前的LIGO搜索技术涉及将候选事件与一组模板进行比较。鉴于信号的不确定性，您将开发独立的模型方法来搜索LIGO数据中的字符串，并为LISA实验提供估计值。