General Relativistic Simulations of Binary Compact Objects

使用移动穿刺方法，现在可以通过许多轨道，合并和最终黑洞的环缩来进化致密物体双星。 主要任务已成为准确地模拟不同的物理问题。 我们将使用这种方法来探索更多的物理现实的情况。 特别是，我们计划解决几个关键的物理问题，如：（一）如何重要的是中子星星自旋中子星星双星的演变？(ii)我们如何才能最好地加入一个很长的后牛顿的螺旋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，我们能得到更好的波形吗？ 美国国家科学基金会的LIGO引力波探测器是世界各地设计用于直接探测和测量引力波的许多新设施之一。 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螺旋和合并（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，以预测螺旋和随后合并的最后部分。 我们的模拟产生的引力波形将对其他科学团体（如LIGO合作）有价值。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。

Using the moving puncture approach, it is now possible to evolve compact-object binaries through many orbits, merger and the ringdown of the final black hole. The main task has become to accurately model different physical problems. We will use this method to explore more physically realistic situations. In particular, we plan to 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 in-spiral 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 get significantly better waveforms if we use more realistic initial data with less artificial "junk" radiation? The NSF's LIGO gravitational wave detector is 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 in-spirals 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 in-spiral and subsequent merger. The gravitational waveforms produced by our simulations will be valuable for other scientific groups such as the LIGO collaboration. 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.