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arXiv 1609.04426gr-qc
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GR的哈密顿方法.第1部分:经典引力的协变理论

Hamiltonian approach to GR - Part 1: covariant theory of classical gravity

Claudio Cremaschini, Massimo Tessarotto

摘要:

广义相对论中一个具有挑战性的问题是确定爱因斯坦场方程中的显协变连续哈密顿结构以及相应的协变哈密顿-雅可比理论的相关公式。该任务是通过采用同步变分原理来实现的,该同步变分原理要求在确定背景时空的几何形状的爱因斯坦场方程的规定的确定性度量张量$\widehat{g}(r)\equiv \left\{ \widehat{g}_{μν}(r)\right\} $解和服从适当的连续体Hamilton方程组的适当的变分场$x\equiv \left\{ g,π\right\} $之间进行区分,这里简称GR-Hamilton方程$.$它表明,达到这样一个目标的先决条件是,铸造相同的方程在进化形式的拉格朗日参数化的装置,一个适当简化的正则态结果,相应的Hamilton Jacobi理论以显协变形式建立。物理意义的理论进行了讨论。这些包括调查的GR-汉密尔顿方程的结构稳定性相对于真空的爱因斯坦方程的解决方案,假设波状扰动的正则演化方程。

英文摘要:

A challenging issue in General Relativity concerns the determination of the manifestly-covariant continuum Hamiltonian structure underlying the Einstein field equations and the related formulation of the corresponding covariant Hamilton-Jacobi theory. The task is achieved by adopting a synchronous variational principle requiring distinction between the prescribed deterministic metric tensor $\widehat{g}(r)\equiv \left\{ \widehat{g}_{μν}(r)\right\} $ solution of the Einstein field equations which determines the geometry of the background space-time and suitable variational fields $x\equiv \left\{ g,π\right\} $ obeying an appropriate set of continuum Hamilton equations, referred to here as GR-Hamilton equations$.$ It is shown that a prerequisite for reaching such a goal is that of casting the same equations in evolutionary form by means of a Lagrangian parametrization for a suitably-reduced canonical state. As a result, the corresponding Hamilton-Jacobi theory is established in manifestly-covariant form. Physical implications of the theory are discussed. These include the investigation of the structural stability of the GR-Hamilton equations with respect to vacuum solutions of the Einstein equations, assuming that wave-like perturbations are governed by the canonical evolution equations.

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