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arXiv 1801.09503gr-qchep-th
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引力能与规范理论观点

Gravitational Energy and the Gauge Theory Perspective

Chiang-Mei Chen, James M. Nester

摘要:

引力和关于它的能量之谜,可以从规范理论的角度来理解。重力,即,动力学时空几何,可以被认为是闵可夫斯基时空对称群的局部规范理论:庞加莱群。庞加莱引力规范理论的动力学势是引力的框架和度规相容联系。时空几何一般既有曲率又有挠率。爱因斯坦的广义相对论是一个特例。局部规范自由度和能量都通过哈密顿公式来阐明。我们已经开发了一个协变的哈密顿公式。哈密顿边界项给出了准局域能量、动量和角动量的协变表达式。一个关键特性是必须在边界上选择非动态参考。有了最佳匹配的参考,人们得到良好的准本地能量动量和角动量值。

英文摘要:

Gravity, and the puzzle regarding its energy, can be understood from a gauge theory perspective. Gravity, i.e., dynamical spacetime geometry, can be considered as a local gauge theory of the symmetry group of Minkowski spacetime: the Poincare group. The dynamical potentials of the Poincare gauge theory of gravity are the frame and the metric-compatible connection. The spacetime geometry has in general both curvature and torsion. Einstein's general relativity theory is a special case. Both local gauge freedom and energy are clarified via the Hamiltonian formulation. We have developed a covariant Hamiltonian formulation. The Hamiltonian boundary term gives covariant expressions for the quasi-local energy, momentum and angular momentum. A key feature is the necessity to choose on the boundary a non-dynamic reference. With a best matched reference one gets good quasi-local energy-momentum and angular momentum values.

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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