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RUI: Numerical Simulations of Black Holes, Neutron Stars and Gravitational Radiation

RUI：黑洞、中子星和引力辐射的数值模拟

基本信息

批准号：
1402780
负责人：
Thomas Baumgarte
金额：
$ 18万
依托单位：
Bowdoin College
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2014
资助国家：
美国
起止时间：
2014-08-01 至 2018-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1402780&HistoricalAwards=false
关键词：
RUI Numerical Simulations Black Holes

项目摘要

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. The equations of general relativity - called Einstein's equations - are sufficiently complex so that they can be solved exactly only under very special circumstances. To understand the merger of two black holes, for example, and to predict the signals that we hope to observe soon with the LIGO gravitational wave observatory, requires computer simulations. This award supports research efforts aimed at developing methods and approaches for such computer simulations. In particular, the focus is on methods that are well suited for the self-consistent treatment of the gravitational forces in supernova explosions. These extremely energetic explosions play an important role in the evolution of the universe, even the development of life, lead to the formation of black holes or neutron stars, and yet we still lack a detailed understanding of the explosion mechanism. The scientific goals of this research effort in numerical relativity 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. The focus of this work is methods in spherical polar coordinates, which have distinct advantages over Cartesian coordinates for many applications, including gravitational collapse, accretion disks, and supernova calculations. This is done in collaboration with colleagues at the Max-Planck-Institute for Astrophysics in Garching, Germany, on including these methods in relativistic astrophysics simulations with a state-of-the-art treatment of microphysical phenomena. Among the long-term goals are supernova simulations that adopt both these advanced microphysics methods and a self-consistent treatment of relativistic gravitational fields. These results will advance our understanding of these processes and will predict their observational signatures in neutrino, electromagnetic and gravitational wave signals. The latter will be important for the new generation of gravitational wave laser interferometers, including the Laser Interferometer Gravitational wave Observatory (LIGO).

爱因斯坦的广义相对论描述了宇宙中所有的引力相互作用，从把一个掉落的苹果拉向地球的力，到宇宙本身的膨胀。广义相对论的方程——被称为爱因斯坦方程——非常复杂，只有在非常特殊的情况下才能精确地解出来。例如，要理解两个黑洞的合并，并预测我们希望不久用LIGO引力波天文台观测到的信号，就需要计算机模拟。该奖项支持旨在开发此类计算机模拟方法和途径的研究工作。特别地，重点是非常适合自洽处理超新星爆炸中的引力的方法。这些能量极高的爆炸在宇宙的演化，甚至生命的发展中起着重要的作用，导致黑洞或中子星的形成，但我们仍然缺乏对爆炸机制的详细了解。本研究在数值相对论方面的科学目标包括发展和实现求解爱因斯坦广义相对论方程的数值算法，以及它们在相对论性物体，特别是中子星和黑洞的数值模拟中的应用。这项工作的重点是球极坐标的方法，它在许多应用中比笛卡尔坐标有明显的优势，包括引力坍缩、吸积盘和超新星计算。这是与德国加兴的马克斯-普朗克天体物理研究所的同事合作完成的，他们将这些方法纳入了相对论天体物理模拟中，并采用了最先进的微物理现象处理方法。长期目标之一是超新星模拟既采用这些先进的微物理方法，又采用相对论引力场的自洽处理。这些结果将促进我们对这些过程的理解，并将预测它们在中微子、电磁波和引力波信号中的观测特征。后者对于包括激光干涉引力波天文台（LIGO）在内的新一代引力波激光干涉仪非常重要。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Aspherical deformations of the Choptuik spacetime

Choptuik 时空的非球面变形

DOI：
10.1103/physrevd.98.084012
发表时间：
2018
期刊：
Physical Review D
影响因子：
5
作者：
Baumgarte, Thomas W.
通讯作者：
Baumgarte, Thomas W.

Critical collapse of ultrarelativistic fluids: Damping or growth of aspherical deformations

DOI：
10.1103/physrevd.98.024053
发表时间：
2018-05
期刊：
Physical Review D
影响因子：
5
作者：
Juliana Celestino;T. Baumgarte
通讯作者：
Juliana Celestino;T. Baumgarte

Numerical relativity in spherical coordinates with the Einstein Toolkit

使用 Einstein 工具包研究球坐标中的数值相对论

DOI：
10.1103/physrevd.97.084059
发表时间：
2018
期刊：
Physical Review D
影响因子：
5
作者：
Mewes, Vassilios;Zlochower, Yosef;Campanelli, Manuela;Ruchlin, Ian;Etienne, Zachariah B.;Baumgarte, Thomas W.
通讯作者：
Baumgarte, Thomas W.

Schwarzschild–de Sitter spacetimes, McVittie coordinates, and trumpet geometries

史瓦西-德西特时空、麦克维蒂坐标和喇叭几何