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arXiv 2103.12017gr-qcastro-ph.GA
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后牛顿哈密顿动力学:在定常时空和统计力学中的应用

Post-Newtonian Hamiltonian dynamics: applications to stationary spacetimes and statistical mechanics

Ronaldo S. S. Vieira, Javier Ramos-Caro, Alberto Saa

摘要:

虽然后牛顿拉格朗日形式主义被广泛应用于相对论动力学和统计研究的测试机构周围的任意质量分布,相应的一般哈密顿形式主义仍然是相对罕见的,基本上被限制在N体问题的情况下。在这里,我们提出了一个一致的哈密顿形式主义的测试粒子在时空中的动力学与任意的能量-动量分布在第一后牛顿(1PN)近似。我们应用我们的形式主义,在静止的轴对称时空的轨道运动,并获得1PN相对论修正准圆形赤道运动的径向和垂直周转频率,结果可能有趣的银河系动力学。对于极薄的磁盘配置的情况下,我们得到一个近似的第三积分,可以用来确定近赤道轨道的包络分析。这种1PN分析的主要优点之一是在所有相关的表达式中明确存在框架拖曳效应,从而允许在旋转时空中进行一些定性预测。最后讨论了1PN无碰撞Boltzmann方程的哈密顿正则变量及其与文献中已有结果的关系。

英文摘要:

Although the post-Newtonian Lagrangian formalism is widely used in relativistic dynamical and statistical studies of test bodies moving around arbitrary mass distributions, the corresponding general Hamiltonian formalism is still relatively uncommon, being restricted basically to the case of N-body problems. Here, we present a consistent Hamiltonian formalism for the dynamics of test particles in spacetimes with arbitrary energy-momentum distributions in the first post-Newtonian (1PN) approximation. We apply our formalism to orbital motion in stationary axisymmetric spacetimes and obtain the 1PN relativistic corrections to the radial and vertical epicyclic frequencies for quasi-circular equatorial motion, a result potentially interesting for galactic dynamics. For the case of razor-thin disk configurations, we obtain an approximated third integral which could be used to determine analytically the envelope of nearly equatorial orbits. One of the main advantages of this 1PN analysis is the explicit presence of frame-dragging effects in all pertinent expressions, allowing some qualitative predictions in rotating spacetimes. We finish discussing the 1PN collisionless Boltzmann equation in terms of the Hamiltonian canonical variables and its relation with previous 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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