RUI: Studies in Numerical Relativity

RUI：数值相对论研究

• 批准号: 2308821
• 负责人: Thomas Baumgarte
• 金额: $ 27万
• 依托单位: Bowdoin College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-05-01 至 2026-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2308821&HistoricalAwards=false
• 关键词: RUI; Studies; Numerical; Relativity

Einstein’s theory of general relativity describes all gravitational interactions in the universe, ranging from the force that pulls a falling apple to the Earth, to the expansion of the Universe itself. In particular, this theory describes black holes and neutron stars — so-called "compact objects" that have extremely strong gravitational fields. The goal of this award is to study what happens when such an object collides with a larger star: would such a collision be observable, would the remnant of the collision form a new type of star, or would it collapse to form another black hole, possibly in an unusual mass range? Answers to these questions will help shed light on the abundance of compact objects, including very small black holes that may have formed in the early Universe and that may contribute to its dark-matter content, and will help understand recent observations by the LIGO gravitational wave detectors of black holes with unusual masses. Finding these answers requires the tools of numerical relativity, i.e. computer programs that can find solutions to Einstein’s equations of general relativity numerically. Undergraduate students will participate in these activities, providing them with a “hands-on” research experience, and generating a research-enriched learning environment at Bowdoin College.The scientific goals of these research efforts include the development and implementation of numerical algorithms for the solution of Einstein's equations of general relativity, as well as their application in the numerical modeling of relativistic objects, in particular neutron stars and black holes. In the next funding period these activities will focus on so-called "Thorne-Zytkow-like-Objects", i.e. larger "host" stars that harbor smaller compact objects as "parasites". Examples include neutron stars that harbor small black holes, possibly of primordial origin, white dwarfs that harbor neutron stars, and main sequence stars that harbor black holes or neutron stars. Specific research activities will explore processes by which these objects may form, including capture and/or binary merger, and will determine whether or not they are dynamically stable, whether their co-evolution and ultimate collapse results in observable gravitational-wave or electromagnetic signals, and whether these scenarios provide viable evolutionary pathways to black holes outside the mass ranges resulting from standard stellar evolution.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.

爱因斯坦的一般相对论理论描述了宇宙中的所有引力相互作用，从将倒下的苹果拉到地球到宇宙本身的扩展，范围从将倒下的苹果拉到地球上。特别是，该理论描述了黑洞和中性恒星 - 所谓的“紧凑物体”具有极强的引力场。该奖项的目的是研究当这样的物体与较大的恒星相撞时会发生什么：这种碰撞是否可以观察到，碰撞的残余会形成新型的恒星，还是会崩溃以在异常质量范围内形成另一个黑洞？这些问题的答案将有助于阐明紧凑物体的抽象，包括可能在早期宇宙中形成的非常小的黑洞，并可能有助于其深色 - 含量的含量，并有助于理解黑孔的Ligo Gractitation Wave探测器的最新观察结果。找到这些答案需要数值相对论的工具，即可以从数值上找到爱因斯坦方程的解决方案的计算机程序。本科生将参加这些活动，为他们提供“动手”的研究经验，并在鲍登学院（Bowdoin College）建立富含研究的学习环境。这些研究工作的科学目标包括开发和实施Einstein方程的数值算法，以解决Einstein方程的一般相对论，以及它们在一般相对论中的应用，以及它们在相关模型中的应用，以及相关性的对象，以及对对象的数字模型。在下一个资金期间，这些活动将集中于所谓的“ thorne-zytkow like-objects”，即较大的“宿主”星，这些恒星将较小的紧凑物体视为“寄生虫”。例子包括具有小黑洞的中子星，可能是原始起源，藏有中子星的白色矮人以及带有黑洞或中子星的主要序列星。 Specific research activities will explore processes by which these objects may form, including capture and/or binary merger, and will determine whether or not they are dynamically stable, whether their co-evolution and ultimate collapse results in observational gravitational-wave or electromagnetic signals, and whether these scenarios provide viable evolutionary pathways to black holes outside the mass ranges resulting from standard stellar evolution.This award reflects NSF's statutory mission and has使用基金会的智力优点和更广泛的影响标准，被认为是珍贵的支持。

项目成果

Critical Phenomena in the Collapse of Gravitational Waves

引力波坍缩的关键现象

• DOI: 10.1103/physrevlett.131.181401
• 发表时间: 2023
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Baumgarte, Thomas W.;Brügmann, Bernd;Cors, Daniela;Gundlach, Carsten;Hilditch, David;Khirnov, Anton;Ledvinka, Tomáš;Renkhoff, Sarah;Fernández, Isabel Suárez
• 通讯作者: Fernández, Isabel Suárez

Could long-period transients be powered by primordial black hole capture?

长周期瞬变能否由原初黑洞捕获提供动力？

• DOI: 10.1103/physrevd.109.063004
• 发表时间: 2024
• 期刊: Physical Review D
• 影响因子: 5
• 作者: Baumgarte, Thomas W.;Shapiro, Stuart L.
• 通讯作者: Shapiro, Stuart L.