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arXiv 1004.3582gr-qchep-th
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(Lovelock)引力中守恒荷的一阶形式

Conserved charges in (Lovelock) gravity in first order formalism

Elias Gravanis

摘要:

我们推导出保守的费用作为准本地的Hamilton协变相空间方法的一类几何拉格朗日函数,可以写在自旋连接,vielbein和可能的其他张量形式的字段,也允许非零扭转。然后,我们重新计算某些已知的结果,并得出一些新的三到六个维度,希望能启发所有这些方面。准局部能量是根据度量而不是其一阶导数定义的,在大多数情况下需要“正则化”才能收敛。与Dirichlet边界条件在一阶形式一致的计数器项被证明是一种有效的方法来去除发散和导出保守电荷的值,明确的应用程序是AdS(或dS)渐近度量。新出现的方案是:消除洛夫洛克引力发散所需要的是边界洛夫洛克引力。

英文摘要:

We derive conserved charges as quasi-local Hamiltonians by covariant phase space methods for a class of geometric Lagrangians that can be written in terms of the spin connection, the vielbein and possibly other tensorial form fields, allowing also for non-zero torsion. We then re-calculate certain known results and derive some new ones in three to six dimensions hopefully enlightening certain aspects of all of them. The quasi-local energy is defined in terms of the metric and not its first derivatives, requiring `regularization' for convergence in most cases. Counter-terms consistent with Dirichlet boundary conditions in first order formalism are shown to be an efficient way to remove divergencies and derive the values of conserved charges, the clear-cut application being metrics with AdS (or dS) asymptotics. The emerging scheme is: all is required to remove the divergencies of a Lovelock gravity is a boundary Lovelock gravity.

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