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Numerical simulations of compact objects in general relativity and modified theories of gravity

广义相对论和修正引力理论中致密物体的数值模拟

基本信息

批准号：
1628481
负责人：
金额：
--
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2015
资助国家：
英国
起止时间：
2015 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1628481
关键词：
Numerical simulations compact objects general

项目摘要

The numerical modelling of black holes and neutron stars in Einstein's theory of general relativity has made enormous progress during the last 10 years and these methods are now applied to a variety of scenarios in astropysics, high-energy physics and the newly emerging field of gravitational-wave physics. This project is dedicated to the computational modelling of neutron stars in the strong-field regime of general relativity as well as generalizations of this theory designed to addressfundamental questions in contemporary physics, most importantly modifications of gravity that may explain the dark-matter and dark-energy problem. Gravitational-wave physics, in particular, will provide the community with unprecedented opportunities to confront such modifications with observational evidence. For this purpose it is vital to develop a theoretical understanding of the gravitational-wave signals expected from astrophysical systems involving compact objects in the framework of general relativity as well its possible generalizations. Particular focus will be on so-called scalar-tensor theories of gravity where, in addition to the metric degrees of freedom, gravity is mediated by one or more additional scalar fields. The specific classes of theories to be considered involve standard scalar-tensor theories as well as more complex theories with so-called screening mechanisms; all these theories are currently considered under the umbrella of Horndesky theories. The physical systems considered include static and dynamic neutron stars, gravitational collapse including supernova core collapse and black-hole spacetimes. In all these cases gravitational-wave forms as well as the systems' dynamics will be studied and compared with the standard-general-relativistic analogs with the goal to identify possible "smoking guns" of modified theories of gravity.

爱因斯坦广义相对论中黑洞和中子星的数值模拟在过去十年中取得了巨大进展，这些方法现在被应用于天体物理学、高能物理学和新兴的引力波物理学领域的各种情况。该项目致力于在广义相对论的强场区域中中子星的计算建模以及该理论的推广，旨在解决当代物理学中的基本问题，最重要的是可以解释暗物质和暗能量问题的重力修正。特别是引力波物理学将为科学界提供前所未有的机会，以观测证据来对抗这种变化。为此目的，必须在广义相对论及其可能的推广的框架内，从理论上理解预期从涉及致密物体的天体物理系统中得到的引力波信号。特别的重点将放在所谓的标量-张量引力理论上，其中，除了度量自由度之外，引力还由一个或多个额外的标量场介导。要考虑的特定理论类别包括标准标量张量理论以及具有所谓屏蔽机制的更复杂的理论;所有这些理论目前都在Horndesky理论的保护伞下考虑。考虑的物理系统包括静态和动态中子星，引力坍缩，包括超新星核心坍缩和黑洞时空。在所有这些情况下，引力波的形式以及系统的动力学将被研究，并与标准的广义相对论类似物进行比较，目的是确定修改后的引力理论可能的“吸烟枪”。