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arXiv 1306.4035hep-th
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GR的引力子散射振幅和纯联系形式

Graviton scattering amplitudes and Pure Connection Formulation of GR

Gianluca Delfino

摘要:

我们展示了如何最近推出的“纯连接公式”的重力接近计算引力子散射振幅的问题提供了一个自然的框架。特别是,我们表明,相互作用的顶点大大简化,在这种形式主义相比,爱因斯坦-希尔伯特微扰理论。这反过来又导致了我们用于直接计算的非常简单的费曼规则。此外,这个框架自然地延伸到更广泛的引力理论,其中包括作为特殊情况的广义相对论。我们计算了这类一般理论中所有可能的树能级引力子-引力子散射振幅。在GR情况下,结果与文献中已知的表达式完全一致。此外,对于不同于GR的一般理论,我们发现了新的树级宇称违反振幅。这种新振幅的存在是一般理论没有表现出显式宇称不变性的直接结果。

英文摘要:

We show how the recently introduced "Pure Connection Formulation" of gravity provides a natural framework for approaching the problem of computing graviton scattering amplitudes. In particular, we show that the interaction vertices are greatly simplified in this formalism as compared to the Einstein-Hilbert perturbation theory. This, in turns, leads to very simple Feynman rules that we employ for the direct computations. Furthermore, this framework naturally extends to wider class of gravitational theories, which encompasses General Relativity as a special case. We compute all the possible tree-level graviton-graviton scattering amplitudes for a general theory from this class. In the GR case the results are in complete accordance with the known expressions in the literature. Moreover, for the general theory distinct from GR, we find new tree-level parity-violating amplitudes. The presence of this new amplitudes is a direct consequence of the fact that the general theory does not exhibit explicit parity invariance.

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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