Signatures from Dark Matter Accretion and Superradiance in Black Hole Ringdown

黑洞衰荡中暗物质吸积和超辐射的特征

• 批准号: 2597355
• 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: 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-2597355
• 关键词: Signatures; Dark; Matter; Accretion; Superradiance

Black hole ring down is, potentially, one of the cleanest observables to be extracted from gravitational wave production from a gravitational collapse event. It is will described in terms of linear perturbation theory and has a number of key features that allow it to be used as a probe of new physics. In this project we plan to characterize the impact on ring down from a range of different effects. The main focus will be on studying the impact of dark matter accretion around a black hole by developing a numerical algorithm that combines an N-body code with a numerical relativity code. There will be a number of technical challenges - how to smooth the energy density of the n-body system, how to accurately define the initial conditions, how to identify the relevant time scales - but, from the first step it should be possible to construct a novel, working tool for studying such systems. With the tool in hand, one can then simulate the dark matter halos around black holes and look for potentially interesting signatures, most notable the impact such halos will have on mergers and the resulting ringdown signal.A second focus will be to model the superradiance from spin 2 fields around a Kerr black hole. It has been shown that higher spin fields enter the super-radiant regime much more efficiently than scalar fields. This means that it should be possible to simulate theses systems much more quickly on a computer and watch the onset of super-radiance. Once this is shown to be true, it should be possible to study the possible onset of super-radiance around binary systems and their backreaction on mergers. Again, the focus will be on how such a process affects ringdown.Finally, it is essential to come up with accurate methods to extract information from the ringdown signal. A final focus will be to develop such methods that can be applied to current and future data.

黑洞环衰可能是从引力坍缩事件产生的引力波中提取的最干净的观测值之一。它将用线性微扰理论进行描述，并具有许多关键特征，使其可以用作新物理学的探针。在这个项目中，我们计划描述一系列不同效应对振铃的影响。主要重点是通过开发一种将 N 体代码与数值相对论代码相结合的数值算法来研究黑洞周围暗物质吸积的影响。将会存在许多技术挑战——如何平滑n体系统的能量密度、如何准确定义初始条件、如何确定相关的时间尺度——但是，从第一步开始，应该有可能构建一种新颖的、可工作的工具来研究此类系统。有了这个工具，人们就可以模拟黑洞周围的暗物质光环，并寻找潜在有趣的特征，最值得注意的是这种光环对合并和产生的振铃信号的影响。第二个重点是对克尔黑洞周围自旋 2 场的超辐射进行建模。事实证明，较高的自旋场比标量场更有效地进入超辐射区域。这意味着应该可以在计算机上更快地模拟这些系统并观察超辐射的出现。一旦这被证明是正确的，就应该有可能研究双星系统周围可能出现的超辐射及其对合并的反作用。同样，重点将放在这样的过程如何影响振铃上。最后，必须提出准确的方法来从振铃信号中提取信息。最后的重点是开发可应用于当前和未来数据的方法。