Dynamical Formation and Evolution of Compact Binaries

致密双星的动态形成和演化

• 批准号: 0855592
• 负责人: Frederic Rasio
• 金额: $ 22.91万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0855592&HistoricalAwards=false
• 关键词: Dynamical; Formation; Evolution; Compact; Binaries

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Coalescing compact binaries, binary star systems with black holes or neutron stars in highly relativistic orbits, are the most important potential sources of gravitational radiation for current laser interferometer detectors such as LIGO. The theoretical study of gravitational wave sources is crucial for the interpretation of data to be collected by the interferometers, and for the planning of future, more advanced detectors. Three related projects are being supported by this award: (1) Numerical calculations of the final mergers of compact binary systems containing a black hole and a neutron star, to be performed using an existing 3-D relativistic hydrodynamics code as part of an ongoing collaboration between Northwestern and Georgia Tech; (2) The development of a new parallel supercomputer code for simulating compact binary mergers in full general relativity, combining a powerful, particle-based algorithm for hydrodynamics ("smoothed particle hydrodynamics") with a fully dynamic and nonlinear treatment of space-time; (3) Stellar dynamics simulations of black holes in dense star clusters, where frequent dynamical interactions can lead to the formation of large numbers of coalescing compact binaries.Coalescing compact binaries are also important in many other areas of astrophysics, such as the study of gamma-ray bursts and the production of heavy chemical elements in galaxies. The stellar dynamics and relativistic hydrodynamics codes to be developed are general tools, which will be useful for studying many other problems involving relativistic stars and fluids. The development of new particle-based numerical algorithms for the study of highly nonlinear and complex multi-physics problems has a strong interdisciplinary character and can help establish closer ties between gravitational physics, computer science, and applied mathematics. Outreach activities are taking advantage of the resources of the nearby Adler Planetarium and Astronomy Museum in Chicago, allowing the research results and methodology to be presented to a large and diverse public.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。在相对论性轨道上的致密双星、含黑洞或中子星的双星星星系统是当前激光干涉仪探测器（如LIGO）最重要的潜在引力辐射源。引力波源的理论研究对于解释干涉仪收集的数据以及规划未来更先进的探测器至关重要。该奖项支持三个相关项目：（1）包含黑洞和中子星星的紧凑双星系统的最终合并的数值计算，将使用现有的三维相对论流体力学代码进行，作为西北大学和格鲁吉亚理工学院之间正在进行的合作的一部分;（2）开发一种新的并行超级计算机代码，用于在完全广义相对论中模拟紧凑的二元合并，流体力学粒子算法（“光滑粒子流体动力学”），对时空作完全动态和非线性处理;（3）稠密星星团中黑洞的恒星动力学模拟，在那里频繁的动力学相互作用可以导致大量合并的致密双星的形成。合并的致密双星在天体物理学的许多其他领域也很重要，例如伽马射线爆发的研究和星系中重化学元素的产生。恒星动力学和相对论流体动力学程序的开发是通用的工具，这将有助于研究涉及相对论恒星和流体的许多其他问题。为研究高度非线性和复杂的多物理问题而开发新的基于粒子的数值算法具有很强的跨学科性质，可以帮助在引力物理、计算机科学和应用数学之间建立更紧密的联系。外联活动正在利用附近芝加哥阿德勒天文馆和天文博物馆的资源，使研究成果和方法能够向广大和不同的公众介绍。