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arXiv 1002.0813hep-thgr-qc
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紫外发散与尺度相关的引力耦合

Ultraviolet Divergences and Scale-Dependent Gravitational Couplings

Herbert W. Hamber

摘要:

我回顾了场论重整化群方法的量子引力,建立在一个非平凡的紫外线在四维不动点的存在。我讨论了这样一个不动点的影响,发现在三个基本上不相关的非微扰方法,以及它如何涉及到量子引力的真空态,特别是运行的$G$。新不动点的一个显著特征是出现了第二个真正的非微扰标度,类似于非阿贝尔规范理论中的标度破坏参数。我认为,这是自然的,以确定这样的规模与小观测到的宇宙学常数,这在量子引力可以出现作为一个非微扰真空凝聚。(全会讲话,第12届马塞尔格罗斯曼会议在广义相对论,天体物理学和相对论场论的最新发展,教科文组织巴黎,2009年7月12日至18日)。

英文摘要:

I review the field-theoretic renomalization group approach to quantum gravity, built around the existence of a non-trivial ultraviolet fixed point in four dimensions. I discuss the implications of such a fixed point, found in three largely unrelated non-perturbative approaches, and how it relates to the vacuum state of quantum gravity, and specifically to the running of $G$. One distinctive feature of the new fixed point is the emergence of a second genuinely non-perturbative scale, analogous to the scaling violation parameter in non-abelian gauge theories. I argue that it is natural to identify such a scale with the small observed cosmological constant, which in quantum gravity can arise as a non-perturbative vacuum condensate. (Plenary Talk, 12-th Marcel Grossmann Conference on Recent Developments in General Relativity, Astrophysics and Relativistic Field Theories, UNESCO Paris, July 12-18, 2009).

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