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arXiv 1004.4549gr-qc
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自旋紧双星后牛顿哈密顿量的辛结构

Symplectic structure of post-Newtonian Hamiltonian for spinning compact binaries

Xin Wu, Yi Xie

摘要:

哈密顿系统的相空间是辛的。然而,在现有的出版物中的后牛顿哈密顿制定的自旋致密双星不具有这种性质,当位置,动量和自旋变量$[X, P, S_1, S_2]$组成其相空间。这为微扰理论在后牛顿公式推导中的应用提供了便利,但也使辛Hamilton系统的经典理论在应用中,特别是在从动力系统理论的角度诊断可积性和不可积性时成为一个严重的障碍。为了更好地理解二元系统的可积性和不可积性的动力学特征,我们构造了一组共轭自旋变量,并重新表示了自旋哈密顿量部分,从而使完整的哈密顿量表述成为辛的.其结果是,它直接显示了与最少的独立隔离积分,保守的哈密顿紧致二元系统的一个自旋和纯轨道部分的任何后牛顿阶通常是可积的,而不是混沌。由两个自旋限制在首阶自旋轨道相互作用和纯轨道部分组成的保守二元系统在所有后牛顿阶也是可积的,与质量比无关。对于所有其他各种旋转的情况,混沌的开始是可能的。

英文摘要:

The phase space of a Hamiltonian system is symplectic. However, the post-Newtonian Hamiltonian formulation of spinning compact binaries in existing publications does not have this property, when position, momentum and spin variables $[X, P, S_1, S_2]$ compose its phase space. This may give a convenient application of perturbation theory to the derivation of the post-Newtonian formulation, but also makes classic theories of a symplectic Hamiltonian system be a serious obstacle in application, especially in diagnosing integrability and nonintegrability from a dynamical system theory perspective. To completely understand the dynamical characteristic of the integrability or nonintegrability for the binary system, we construct a set of conjugate spin variables and reexpress the spin Hamiltonian part so as to make the complete Hamiltonian formulation symplectic. As a result, it is directly shown with the least number of independent isolating integrals that a conservative Hamiltonian compact binary system with both one spin and the pure orbital part to any post-Newtonian order is typically integrable and not chaotic. And conservative binary system consisting of two spins restricted to the leading order spin-orbit interaction and the pure orbital part at all post-Newtonian orders is also integrable, independently on the mass ratio. For all other various spinning cases, the onset of chaos is possible.

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