Neutron Star Dynamics in the Era of Gravitational Wave Astronomy

引力波天文学时代的中子星动力学

• 批准号: 413873357
• 负责人: Professor Dr. Kostas Kokkotas, Ph.D.
• 金额: --
• 依托单位: Abteilung Theoretische Astrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/413873357?language=en
• 关键词: Neutron; Star; Dynamics; Era; Gravitational

Neutron stars are the densest objects in the present Universe. These unique and irreproducible laboratories allow us to study physics in some of its most extreme regimes. The multifaceted nature of neutron stars involves a delicate interplay among astrophysics, gravitational physics, and nuclear physics as it was demonstrated by the recent discovery of merging neutron stars. In a few dozens papers published simultaneously across several journals, this spectacular event linked to a vast range of already observed phenomena and provided fresh insights on everything from fundamental nuclear physics to the large-scale evolution of the universe.This event together with the preceding discoveries of black-hole mergers turned gravitational physics into an observational science. Many more discoveries are expected to come in the next five years within the operation of Advanced LIGO, Virgo, KAGRA, and INDIGO and in the decades to follow with the operation of next generation detectors.Gravitational Waves by tight binary neutron star systems, supernovae explosions, non-axisymmetric or unstable spinning neutron stars will provide us with a unique opportunity to make major breakthroughs in not only gravitational physics, but also in particle and high-energy astrophysics.In this project we are planning to expand gravitational wave asteroseismology to fast rotating neutron stars by taking into account for the first time the contribution of a dynamical spacetime. The results will be mainly used to model and study gravitational wave signals from merging neutron stars and gravitational collapse. We expect to deliver information about the sequence of events, the details of nuclear equation of state and to provide constraints in the amplification of magnetic fields. The universal relations among the various associated observables (frequencies and damping/growth of oscillations, moment of inertia, compactness) can be used to link the observations in electromagnetic and gravitational wave spectrum with the structure of the associated objects and the sequence of events that take place during the very short but extremely dynamical period of their life.

中子星是目前宇宙中最密集的天体。这些独特的和不可复制的实验室使我们能够研究物理学的一些最极端的制度。中子星的多面性涉及天体物理学、引力物理学和核物理学之间微妙的相互作用，正如最近发现的合并中子星所证明的那样。在几个期刊上同时发表的几十篇论文中，这一壮观的事件与大量已经观察到的现象联系在一起，并为从基础核物理到宇宙大尺度演化的一切提供了新的见解。这一事件与之前发现的黑洞合并一起将引力物理学转变为一门观测科学。预计在未来五年内，在先进LIGO、Virgo、KAGRA和靛蓝的运行中，以及在下一代探测器的运行中，将有更多的发现。 系统、超新星爆炸、非轴对称或不稳定的旋转中子星将为我们提供一个独特的机会，不仅在引力物理学，而且在粒子和高能天体物理学方面取得重大突破。在这个项目中，我们计划通过首次考虑动力时空的贡献，将引力波星震学扩展到快速旋转中子星。这些结果将主要用于模拟和研究来自合并中子星和引力坍缩的引力波信号。我们期望提供有关事件序列的信息，核状态方程的细节，并提供磁场放大的约束。 各种相关观测量（频率和振荡的阻尼/增长，惯性矩，紧致度）之间的普遍关系可以用来将电磁波和引力波频谱中的观测与相关物体的结构以及在其生命中非常短但非常动态的时期内发生的事件序列联系起来。