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arXiv 1012.4280hep-thgr-qc
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Holst Action的重整化群流

Renormalization Group Flow of the Holst Action

J. -E. Daum, M. Reuter

摘要:

以自旋联系和维尔本为基本场变量,研究了量子引力的重整化群性质。尺度相关的有效作用量必须在时空同构和局部坐标系旋转下都是不变的。非微扰RG方程求解显式截断的理论空间定义的Holst型行动,其中涉及一个运行的Immirzi参数的三个参数的家庭。我们发现了一个渐近安全的基本理论存在的证据,可能不等价于以同样方式构造的度规量子引力。

英文摘要:

The renormalization group (RG) properties of quantum gravity are explored, using the vielbein and the spin connection as the fundamental field variables. The scale dependent effective action is required to be invariant both under space time diffeomorphisms and local frame rotations. The nonperturbative RG equation is solved explicitly on the truncated theory space defined by a three parameter family of Holst-type actions which involve a running Immirzi parameter. We find evidence for the existence of an asymptotically safe fundamental theory, probably inequivalent to metric quantum gravity constructed in the same way.

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