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arXiv 2402.05049gr-qcnlin.SI
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相对论性自旋致密天体 II 的辛力学:史瓦西时空中的正则形式

Symplectic mechanics of relativistic spinning compact bodies II.: Canonical formalism in the Schwarzschild spacetime

Paul Ramond, Soichiro Isoyama

AI总结:

本文在史瓦西时空中构建了包含线性自旋修正的正则坐标系,推广经典 Andoyer 变量,给出作用量-角度坐标与规范不变频率的显式公式,并验证了圆轨道情形下的有效性。

摘要:

本工作是一系列研究的第二部分,旨在利用哈密顿力学的工具研究广义相对论中扩展体的运动。本工作的第一部分[参考文献[1, 2]]构建了一个十维协变哈密顿框架,涵盖了任意时空中测地运动的所有线性自旋修正。该框架被证明在史瓦西和克尔时空中具体是可积的。本工作将这一抽象的可积性结果转化为史瓦西时空中致密天体线性自旋哈密顿动力学的具体应用。特别地,明确构造了一个正则坐标系,该坐标系利用了史瓦西时空的球对称性。这些坐标基于牛顿刚体运动的经典 Andoyer 变量的相对论推广。这一正则设置使我们能够推导出即用型的角度-作用量坐标和规范不变的哈密顿频率公式,这些公式自动包含所有线性自旋效应。无需外部参数或临时选择,该框架可用于通过求积找到一般(束缚或非束缚)线性自旋轨道的完整解,包括轨道倾角、进动和偏心率,以及自旋进动。该形式体系的有效性在具有任意自旋和轨道进动的圆轨道背景下得到展示,结果与文献中已知结果进行了验证。

英文摘要:

This work constitutes the second part of a series of studies that aim to utilise tools from Hamiltonian mechanics to investigate the motion of an extended body in general relativity. The first part of this work [Refs. [1, 2]] constructed a ten-dimensional, covariant Hamiltonian framework encompassing all the linear-in-spin corrections to the geodesic motion in arbitrary spacetime. This framework was proven to be integrable in the Schwarzschild and Kerr spacetimes, specifically. The present work translates this abstract integrability result into tangible applications for linear-in-spin Hamiltonian dynamics of a compact object in a Schwarzschild spacetime. In particular, a canonical system of coordinates is constructed explicitly, which exploits the spherical symmetry of the Schwarzschild spacetime. These coordinates are based on a relativistic generalization of the classical Andoyer variables of Newtonian rigid body motion. This canonical setup allows us to derive ready-to-use formulae for action-angle coordinates and gauge-invariant Hamiltonian frequencies, which automatically include all linear-in-spin effects. No external parameters or ad hoc choices are necessary, and the framework can be used to find complete solutions by quadrature of generic (bound or unbound), linear-in-spin orbits, including orbital inclination, precession and eccentricity, as well as spin precession. The efficacy of the formalism is demonstrated here in the context of circular orbits with arbitrary spin and orbital precession, with the results validated against known results in the literature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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