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arXiv 1407.6992gr-qc
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高阶共变双张量的测地偏差

Geodesic deviation at higher orders via covariant bitensors

Justin Vines

摘要:

我们回顾了一个简单的,但有益的应用程序的形式主义的协变双张量,使用偏差向量场沿基准测地线来描述一个相邻的世界线,在一个精确的和明显的协变的方式,通过指数映射。要求相邻的世界线是测地线,导致偏差向量的通常的线性测地线偏差方程,加上偏差和相对速度的高阶修正。我们展示了如何通过协变双张量展开有效地计算这些修正到任意阶,推导出一种适用于所有阶次的测地线偏差方程的形式,并通过四阶产生其显式扩展形式。我们还讨论了广义Jacobi方程、高阶测地线偏差方程的作用原理、描述加速邻域世界线的结果以及二阶测地线偏差方程的形式通解。

英文摘要:

We review a simple but instructive application of the formalism of covariant bitensors, to use a deviation vector field along a fiducial geodesic to describe a neighboring worldline, in an exact and manifestly covariant manner, via the exponential map. Requiring the neighboring worldline to be a geodesic leads to the usual linear geodesic deviation equation for the deviation vector, plus corrections at higher order in the deviation and relative velocity. We show how these corrections can be efficiently computed to arbitrary orders via covariant bitensor expansions, deriving a form of the geodesic deviation equation valid to all orders, and producing its explicit expanded form through fourth order. We also discuss the generalized Jacobi equation, action principles for the higher-order geodesic deviation equations, results useful for describing accelerated neighboring worldlines, and the formal general solution to the geodesic deviation equation through second order.

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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