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Dynamics of fast spinning neutron stars around a black hole

黑洞周围快速旋转中子星的动力学

基本信息

批准号：
1743233
负责人：
金额：
--
依托单位：
University College London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1743233
关键词：
Dynamics fast spinning neutron stars

项目摘要

Strongly bound gravitational systems often show interesting dynamical phenomena. Spinning finite-size objects in gravity would not follow geodesics in a space-time manifold. A fast spinning neutron stars or a neutron-star binary system orbiting around a black hole would exhibit complex spin and orbital behaviours due to various relativistic coupling. This project investigates two special classes of such systems: (1) a fast spinning NS orbiting around a BH, and (2) a double neutron-star system orbiting around a BH (which is a hierarchical 3-body system). In (1) spin-curvature coupling leads to non-planar NS orbits, in addition to de-Sitter and Lense-Thirring precessions of the neutron star's spin. In (2) orbit-orbit coupling induces gravito-magnetism, which manifests in the complex orbital and spin motion of the double neutron-star system. Radio pulsar timing and gravitational wave observations will be able to study the dynamical properties of these systems. Black hole - neutron star systems are useful in the study of fundamental physics and in astrophysics. They can be used to map the space-time structure around black holes and to determine the masses and spins of the massive nuclear black holes in galaxies. This is a theoretical project. It involves phenomenological modelling, algebraic computation and numerical calculations.

强束缚引力系统经常表现出有趣的动力学现象。在重力作用下旋转有限尺寸的物体不会遵循时空流形中的测地线。由于各种相对论耦合，快速旋转的中子星或围绕黑洞轨道运行的中子星双星系统将表现出复杂的自旋和轨道行为。该项目研究了两类特殊的此类系统：(1) 围绕 BH 运行的快速旋转 NS，以及 (2) 围绕 BH 运行的双中子星系统（这是一个分层三体系统）。在 (1) 中，除了中子星自旋的 de-Sitter 和 Lense-Thirring 进动之外，自旋曲率耦合也会导致非平面 NS 轨道。在（2）中，轨道-轨道耦合引起引力-磁力，这体现在双中子星系统复杂的轨道和自旋运动中。射电脉冲星授时和引力波观测将能够研究这些系统的动力学特性。黑洞-中子星系统对于基础物理学和天体物理学的研究很有用。它们可用于绘制黑洞周围的时空结构，并确定星系中大质量核黑洞的质量和自旋。这是一个理论项目。它涉及现象学建模、代数计算和数值计算。