Gravitational Waves from Neutron Star and Black Hole Mergers

中子星和黑洞合并产生的引力波

• 批准号: 360292238
• 负责人: Professor Dr. Bernd Brügmann
• 金额: --
• 依托单位: Theoretisch-Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/360292238?language=en
• 关键词: Gravitational; Waves; Neutron; Star; Black

The first direct detection of gravitational waves in 2015 was ahistoric breakthrough in gravitational physics. The first signals wereidentified as merger events of two black holes, which demonstratedthat mergers of compact binaries are indeed primary candidates forgravitational wave sources. The focus of the proposal is on compactbinaries involving neutron stars, either in a neutron star binary or abinary formed by a neutron star and a black hole, which are describedby general relativity coupled to general relativistic hydrodynamics.The data analysis and parameter estimation for merger events rely onnumerical simulations that solve the two-body problem of Einstein'sgeneral theory of relativity in the highly-dynamic strong-fieldregime. The goal is to provide theoretical models for the relativisticdynamics, the merger process with ejecta and torus formation, and thegeneration of gravitational waves. So far, the system that has beenpredominantly studied in numerical relativity is non-spinning neutronstars of equal or comparable mass on quasi-circular orbits. In recentwork technical limitations in constructing general relativistic datafor spinning neutron stars in binaries were resolved. The main goal of theproject is to greatly extend the first proof-of-principle calculationswith spin. By varying the spins, masses and eccentricity of thebinary, the long-term goal is to thereby complete the gravitationalparameter space accessible to numerical relativity and to prepare forthe corresponding gravitational wave observations that are expected inthe near future.

2015年首次直接探测到引力波，是引力物理学的历史性突破。第一个信号被确定为两个黑洞的合并事件，这表明致密双星的合并确实是引力波源的主要候选者。该提案的重点是涉及中子星的致密双星，无论是中子星星星双星还是由中子星星和黑洞形成的双星，都是由广义相对论耦合到广义相对论流体力学来描述的。合并事件的数据分析和参数估计依赖于数值模拟，解决了爱因斯坦广义相对论在高动态强场区的两体问题。其目标是为相对论动力学、抛射物和环面形成的合并过程以及引力波的产生提供理论模型。到目前为止，在数值相对论中主要研究的系统是在准圆轨道上质量相等或相当的非自旋中子星。在最近的工作中，在构造双星中自旋中子星的广义相对论数据方面的技术限制得到了解决。该项目的主要目标是极大地扩展第一个自旋原理证明计算。通过改变双星的自旋、质量和偏心率，长期目标是由此完成数值相对论可访问的引力参数空间，并为预期在不久的将来进行的相应引力波观测做准备。