Studies of General Relativistic Compact-Object Binaries

广义相对论致密天体双星的研究

• 批准号: 1305387
• 负责人: Wolfgang Tichy
• 金额: $ 12.6万
• 依托单位: Florida Atlantic University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1305387&HistoricalAwards=false
• 关键词: Studies; General; Relativistic; Compact; Object

This award funds a research project under the direction of Professor Wolfgang Tichy at Florida Atlantic University.The NSF's LIGO gravitational wave detectors are among a number of new facilities all over the world which are designed to directly detect and measure gravitational waves. These waves will come from a variety of astrophysical sources and will open a new window to the universe. One of the most promising sources for these detectors are the inspirals and mergers of compact-object binaries (i.e., systems containing black holes or neutron stars). As the two objects get close, fully non-linear numerical simulations of the Einstein equations are required to make predictions about the final part of the inspiral and subsequent merger. This project will address several key physics issues such as: (i) How important is neutron star spin in the evolution of neutron star binaries? (ii) How can we best join a very long post-Newtonian inspiral waveform and a numerically obtained waveform from a compact object binary? (iii) Up to which frequency can post-Newtonian waveforms be trusted, and how does this frequency depend on spins and mass ratios? (iv) Can we obtain significantly better waveforms if we use more realistic initial data with less artificial "junk" radiation?This project is also envisioned to have significant broader impacts. Part of the proposed research will be carried out in close collaboration with the relativity group at the University of Jena in Germany. The planned research will involve at least one graduate student at FAU and one postdoc at the University of Jena. Thus the planned research will have educational benefits for the students and postdocs involved. They will not only learn about the science related to this project, but also more broadly about programming supercomputers and data management. Professor Tichy also intends to give public lectures on his research, and develop new course curricula based on research results.

该奖项资助了佛罗里达大西洋大学Wolfgang Tichy教授指导下的一个研究项目。NSF的LIGO引力波探测器是世界各地旨在直接探测和测量引力波的一些新设施之一。这些波将来自各种天体物理学来源，并将打开一扇通往宇宙的新窗口。这些探测器最有希望的来源之一是致密天体双星的吸气和合并（即，包含黑洞或中子星的系统）。当两个物体靠近时，需要对爱因斯坦方程进行完全非线性的数值模拟，以预测螺旋的最后部分和随后的合并。这个项目将解决几个关键的物理问题，如：（一）中子星星自旋在中子星星双星演化中有多重要？(ii)我们如何才能最好地加入一个很长的后牛顿inspiral波形和一个数字获得的波形从一个紧凑的对象二进制？(iii)后牛顿波形在多大的频率下可以被信任，这个频率是如何依赖于自旋和质量比的？(iv)如果我们使用更真实的初始数据和更少的人工“垃圾”辐射，我们是否可以获得更好的波形？预计该项目还将产生更广泛的重大影响。部分拟议中的研究将与德国耶拿大学的相对论小组密切合作进行。计划中的研究将涉及至少一名FAU的研究生和一名耶拿大学的博士后。因此，计划中的研究将对参与的学生和博士后有教育意义。他们不仅将学习与该项目相关的科学知识，还将更广泛地了解超级计算机编程和数据管理。Tichy教授还打算就他的研究进行公开讲座，并根据研究成果开发新的课程。