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arXiv 2007.00995hep-thgr-qc
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GR的手征微扰理论

Chiral perturbation theory for GR

Kirill Krasnov, Yuri Shtanov

摘要:

本文以手征一阶Einstein-Cartan作用量为出发点,描述了一种新的广义相对论微扰理论。我们的主要结果是一个新的规范固定程序,消除了连接到连接传播。所有其他已知的一阶形式主义有这个传播非零,这显着增加了任何微扰计算的组合复杂性。相比之下,在没有连接到连接传播子的情况下,我们的形式主义导致了一个有效的描述,其中只有度量(或四元组)传播,只有三次和四次顶点,但有些顶点腿是特殊的,因为它们不能被传播子连接。新的形式主义是著名的和强大的手征描述杨米尔斯理论的重力模拟。

英文摘要:

We describe a new perturbation theory for General Relativity, with the chiral first-order Einstein-Cartan action as the starting point. Our main result is a new gauge-fixing procedure that eliminates the connection-to-connection propagator. All other known first-order formalisms have this propagator non-zero, which significantly increases the combinatorial complexity of any perturbative calculation. In contrast, in the absence of the connection-to-connection propagator, our formalism leads to an effective description in which only the metric (or tetrad) propagates, there are only cubic and quartic vertices, but some vertex legs are special in that they cannot be connected by the propagator. The new formalism is the gravity analog of the well-known and powerful chiral description of Yang-Mills theory.

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