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arXiv 0802.2527gr-qchep-thmath-phmath.MP
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一阶形式的渐近性和Hamilton性

Asymptotics and Hamiltonians in a First order formalism

Abhay Ashtekar, Jonathan Engle, David Sloan

摘要:

我们考虑在空间无穷远渐近平坦的四维时空,并证明在一阶框架下广义相对论的作用量原理是明确的\emph{without the need of infinite counter terms.}。它自然地导致一个协变相空间,在这个协变相空间中,产生渐近对称的哈密顿量提供了时空的总能量动量和角动量。我们解决的微妙的,但重要的问题,因为在拉格朗日和哈密顿框架中的对数翻译和超翻译。正如一篇即将发表的论文所表明的,高维的处理要简单得多。我们的一阶框架也提出了一个新的方向推广的非交换几何的谱作用。

英文摘要:

We consider 4-dimensional space-times which are asymptotically flat at spatial infinity and show that, in the first order framework, action principle for general relativity is well-defined \emph{without the need of infinite counter terms.} It naturally leads to a covariant phase space in which the Hamiltonians generating asymptotic symmetries provide the total energy-momentum and angular momentum of the space-time. We address the subtle but important problems that arise because of logarithmic translations and super-translations both in the Langrangian and Hamiltonian frameworks. As a forthcoming paper will show, the treatment of higher dimensions is considerably simpler. Our first order framework also suggests a new direction for generalizing the spectral action of non-commutative geometry.

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