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arXiv 0712.0445hep-th
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关于f(R)-引力的重整化群流

On the renormalization group flow of f(R)-gravity

Pedro F. Machado, Frank Saueressig

摘要:

本文利用量子引力的泛函重整化群方程构造了一个修正引力理论的非微扰流方程,其形式为$S = \int d^dx \sqrt{g} f(R)$。基于这个方程,我们表明,某些引力相互作用单项式可以一贯解耦的重整化群(RG)流和再现最近的结果的渐近安全猜想。本文详细研究了Einstein-Hilbert截断的非局部扩展的非微扰RG流,其中包括$\int d^dx \sqrt{g} \ln(R)$和$\int d^dx \sqrt{g} R^{-n}$相互作用.包含这样的相互作用解决了红外奇异性包围RG轨道与积极的宇宙学常数在以前的截断。特别是,在一些$R^{-n}$截断所有的物理轨迹从一个非高斯(UV)固定点发出,并在所有RG尺度上定义良好。$\ln(R)$ -截断的RG流包含一个红外吸引子,它动态地驱动一个正的宇宙学常数为零。

英文摘要:

We use the functional renormalization group equation for quantum gravity to construct a non-perturbative flow equation for modified gravity theories of the form $S = \int d^dx \sqrt{g} f(R)$. Based on this equation we show that certain gravitational interactions monomials can be consistently decoupled from the renormalization group (RG) flow and reproduce recent results on the asymptotic safety conjecture. The non-perturbative RG flow of non-local extensions of the Einstein-Hilbert truncation including $\int d^dx \sqrt{g} \ln(R)$ and $\int d^dx \sqrt{g} R^{-n}$ interactions is investigated in detail. The inclusion of such interactions resolves the infrared singularities plaguing the RG trajectories with positive cosmological constant in previous truncations. In particular, in some $R^{-n}$-truncations all physical trajectories emanate from a Non-Gaussian (UV) fixed point and are well-defined on all RG scales. The RG flow of the $\ln(R)$-truncation contains an infrared attractor which drives a positive cosmological constant to zero dynamically.

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