arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.04727gr-qc
收藏

黑洞时空中在保守自作用力作用下的运动是可积哈密顿系统吗?

Is motion under the conservative self-force in black hole spacetimes an integrable Hamiltonian system?

Justin Vines, Éanna É. Flanagan

摘要:

一个在背景黑洞时空中运动的点状物体会受到一个引力自作用力,这个引力自作用力可以表示为物体瞬时位置和速度的局部函数,并以质量比的线性顺序表示。我们考虑由局部自作用力的保守部分定义的世界线动力学,关闭耗散部分,我们问:这个动力学系统是哈密顿系统吗?如果是,它是可积的吗?在史瓦西时空中,我们证明了系统是哈密顿和可积的,在质量比的线性顺序,一般(但不一定是所有)稳定的束缚轨道。存在一个能量和一个角动量,它们是测地线运动的对应物的微扰形式,它们在受迫运动下是守恒的。我们还讨论了在克尔时空中建立类似结果的困难。这一结果可能是有用的未来的计算方案,基于当地的哈密顿描述,计算保守的自我力量和可观察到的效果。它也与有效单体形式主义中一般轨道的保守动力学的哈密顿量存在的假设有关,与质量比中的线性顺序有关,但与后牛顿展开中的所有顺序有关。

英文摘要:

A point-like object moving in a background black hole spacetime experiences a gravitational self-force which can be expressed as a local function of the object's instantaneous position and velocity, to linear order in the mass ratio. We consider the worldline dynamics defined by the conservative part of the local self-force, turning off the dissipative part, and we ask: Is that dynamical system a Hamiltonian system, and if so, is it integrable? In the Schwarzschild spacetime, we show that the system is Hamiltonian and integrable, to linear order in the mass ratio, for generic (but not necessarily all) stable bound orbits. There exist an energy and an angular momentum, being perturbed versions of their counterparts for geodesic motion, which are conserved under the forced motion. We also discuss difficulties associated with establishing analogous results in the Kerr spacetime. This result may be useful for future computational schemes, based on a local Hamiltonian description, for calculating the conservative self-force and its observable effects. It is also relevant to the assumption of the existence of a Hamiltonian for the conservative dynamics for generic orbits in the effective-one-body formalism, to linear order in the mass ratio, but to all orders in the post-Newtonian expansion.

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。

↑