Collaborative Research: Photons from Binary Black Hole Inspiral

合作研究：来自双黑洞螺旋的光子

• 批准号: 1811287
• 负责人: Julian Krolik
• 金额: $ 0.88万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1811287&HistoricalAwards=false
• 关键词: Collaborative; Research; Photons; Binary; Black

Every large galaxy contains a supermassive black hole in its center. Galaxies merge from time to time, therefore it is expected, but not yet demonstrated, that recently merged galaxies hold two large black holes, which eventually form a bound pair and later merge. It is generally expected that supermassive black hole binaries can often accumulate sizable quantities of gas, and therefore be bright for a significant time before and during the merge, as well as the relaxation period there after. However, because it is estimated that there are only very few such mergers per year in the entire Universe, understanding the specific features to search for is required to discover them. A team of researchers and graduate students from the Rochester Institute of Technology (RIT), Johns Hopkins University (JHU), and the University of Tulsa (TU) propose to use the Blue Waters supercomputer to perform the first realistic simulations of gas surrounding supermassive binary black holes on route to merger. These simulations will provide predictions of light and timing signatures emitted by supermassive black hole mergers in order to allow for their observational discovery.The focus of this project is to define the features that identify the process of supermassive black hole mergers, using large-scale numerical simulations that assume astrophysically relevant initial conditions and include all the principal relevant physics: magnetohydrodynamics, general relativity, and radiation transfer. These simulations are extremely challenging computationally because of the complexity of the physics involved. However, the project introduces two significant computation innovations: a time-dependent high-order post-Newtonian spacetime to substitute for explicit solution of the Einstein Field Equations and a multipatch scheme to coordinate separate treatment of regions with contrasting grid requirements. In addition to the simulation activities, the project is expected to create opportunities to integrate many existing research programs into a larger community of scientists, students, and the general public. It will foster cross-disciplinary collaboration among undergraduate students, graduate students, postdoctoral researchers and faculty at RIT, JHU and TU. Through this network, previous highly successful outreach programs will be able to reach an even larger and more diverse audience, and will provide many more opportunities for students to interact and collaborate with researchers outside their home institutions. It will also result in educating a number of graduate students and post-docs in the techniques of very large-scale computation, which will be important skills for their future careers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

每个大星系的中心都包含一个超大质量黑洞。 星系时常合并，因此预计但尚未证明，最近合并的星系拥有两个大黑洞，它们最终形成一对束缚并随后合并。人们普遍预计，超大质量黑洞双星通常会积累大量气体，因此在合并之前和合并期间以及之后的弛豫期的相当长一段时间内都是明亮的。 然而，由于估计整个宇宙中每年这样的合并很少，因此需要了解要搜索的具体特征才能发现它们。来自罗彻斯特理工学院 (RIT)、约翰霍普金斯大学 (JHU) 和塔尔萨大学 (TU) 的研究人员和研究生团队提议使用 Blue Waters 超级计算机对超大质量双星周围的气体进行首次真实模拟黑洞正在走向合并。 这些模拟将提供对超大质量黑洞合并发出的光和时间特征的预测，以便进行观测发现。该项目的重点是使用大规模数值计算来定义识别超大质量黑洞合并过程的特征。假设天体物理学相关初始条件并包括所有主要相关物理学的模拟：磁流体动力学、广义相对论和辐射传输。 由于所涉及物理的复杂性，这些模拟在计算上极具挑战性。然而，该项目引入了两项重要的计算创新：一个依赖时间的高阶后牛顿时空来替代爱因斯坦场方程的显式解，以及一个多面体方案来协调具有对比网格要求的区域的单独处理。 除了模拟活动之外，该项目预计还将创造机会，将许多现有的研究项目整合到更大的科学家、学生和公众社区中。它将促进 RIT、JHU 和 TU 的本科生、研究生、博士后研究人员和教师之间的跨学科合作。通过这个网络，以前非常成功的外展项目将能够接触到更多、更多样化的受众，并将为学生提供更多与所在机构之外的研究人员互动和合作的机会。它还将培养一些研究生和博士后超大规模计算技术，这将是他们未来职业生涯的重要技能。该奖项反映了 NSF 的法定使命，并通过评估认为值得支持利用基金会的智力优势和更广泛的影响审查标准。

项目成果

Electromagnetic Emission from Supermassive Binary Black Holes Approaching Merger

即将合并的超大质量双黑洞的电磁发射

• DOI: 10.3847/1538-4357/aad8b4
• 发表时间: 2018
• 期刊: The Astrophysical Journal
• 作者: d’Ascoli, Stéphane;Noble, Scott C.;Bowen, Dennis B.;Campanelli, Manuela;Krolik, Julian H.;Mewes, Vassilios
• 通讯作者: Mewes, Vassilios

Mass-ratio and Magnetic Flux Dependence of Modulated Accretion from Circumbinary Disks

环形盘调制吸积的质量比和磁通量依赖性

• DOI: 10.3847/1538-4357/ac2229
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Noble, Scott C.;Krolik, Julian H.;Campanelli, Manuela;Zlochower, Yosef;Mundim, Bruno C.;Nakano, Hiroyuki;Zilhão, Miguel
• 通讯作者: Zilhão, Miguel

Circumbinary Disk Accretion into Spinning Black Hole Binaries

• DOI: 10.3847/1538-4357/abf0af
• 发表时间: 2021-01
• 期刊: The Astrophysical Journal
• 作者: F. L. Lopez Armengol;L. Combi;M. Campanelli;S. Noble;J. Krolik;Dennis B. Bowen;M. Avara;V. Mewes;H. Nakano

Quasi-periodic Behavior of Mini-disks in Binary Black Holes Approaching Merger

• DOI: 10.3847/2041-8213/aaa756
• 发表时间: 2018-01-20
• 期刊: ASTROPHYSICAL JOURNAL LETTERS
• 影响因子: 7.9
• 作者: Bowen, Dennis B.;Mewes, Vassilios;Zilhao, Miguel
• 通讯作者: Zilhao, Miguel

Quasi-periodicity of Supermassive Binary Black Hole Accretion Approaching Merger

超大质量双黑洞吸积接近合并的准周期性

• DOI: 10.3847/1538-4357/ab2453
• 发表时间: 2019
• 期刊: The Astrophysical Journal
• 作者: Bowen, Dennis B.;Mewes, Vassilios;Noble, Scott C.;Avara, Mark;Campanelli, Manuela;Krolik, Julian H.
• 通讯作者: Krolik, Julian H.