Strongly Gravitating Systems and Waves in General Relativity

广义相对论中的强引力系统和波

• 批准号: 9600507
• 负责人: Wai-Mo Suen
• 金额: $ 24.1万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-15 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9600507&HistoricalAwards=false
• 关键词: Strongly; Gravitating; Systems; Waves; General

This research is on the numerical study of strongly gravitating systems with special emphasis on the properties of the gravitational waves they generated in dynamical evolutions. This uses supercomputers for fully numerical treatments, and semi-analytical methods closely coupled to the numerical treatments, to study highly non-linear and dynamical astrophysical events, like the inspiral coalescence of compact binary systems consisting of neutron stars and/or black holes. One of the focuses of the research is on the accurate numerical constructions and analyses of 3D black hole spacetimes. Instead of the traditional approach of using time slicings to avoid the singularities inherent in black hole spacetimes, Prof. Suen's group will develop an approach in full 3+1 numerical relativity which uses the apparent horizons as inner boundaries in dynamical evolutions. This apparent horizon boundary condition approach is expected to have major impact on the numerical study of black hole spacetimes. Apparent horizons and event horizons are important characteristic of black holes. The PI is developing routines to determine their existence and locations, as well as tools for analyzing their properties, in a numerically constructed 3+1 dimensional spacetime. These routines, to be available to the numerical relativity community soon, will have impact on the study of black holes.

这项研究是关于强引力系统的数值研究，特别强调它们在动力学演化中产生的引力波的性质。它使用超级计算机进行完全的数值处理，以及与数值处理紧密耦合的半解析方法，以研究高度非线性和动态的天体物理事件，如由中子星和/或黑洞组成的致密双星系统的自旋合并。研究的重点之一是三维黑洞时空的精确数值构造和分析。孙教授的团队将开发一种完全3+1数值相对论的方法，使用视界作为动力学演化的内边界，而不是使用时间切片来避免黑洞时空固有的奇异性。这种视界边界条件方法有望对黑洞时空的数值研究产生重大影响。视界和事件视界是黑洞的重要特征。PI正在开发例程来确定它们的存在和位置，以及用于在数字构建的3+1维时空中分析它们的性质的工具。这些即将提供给数值相对论社区的例行公事，将对黑洞的研究产生影响。