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arXiv 1408.0276hep-thgr-qc
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渐近安全性与宇宙学常数

Asymptotic safety and the cosmological constant

Kevin Falls

摘要:

研究了四维量子引力的非微扰重整化。注意解开物理自由度,我们观察到的拓扑性质的共形波动所产生的功能措施。由此产生的β函数具有一个渐近安全的不动点与全球的相位结构,导致经典的广义相对论的积极,消极或消失的宇宙学常数。只要共形涨落被量子化,我们就能找到一个渐近安全的不动点,预言在所有尺度上宇宙学常数都为零。在这个固定点,我们重现的临界指数,$ν= 1/3$,发现在数值晶格研究的Hamber。这表明,在解决宇宙学常数问题时,不动点可能是物理的。

英文摘要:

We study the non-perturbative renormalisation of quantum gravity in four dimensions. Taking care to disentangle physical degrees of freedom, we observe the topological nature of conformal fluctuations arising from the functional measure. The resulting beta functions possess an asymptotically safe fixed point with a global phase structure leading to classical general relativity for positive, negative or vanishing cosmological constant. If only the conformal fluctuations are quantised we find an asymptotically safe fixed point predicting a vanishing cosmological constant on all scales. At this fixed point we reproduce the critical exponent, $ν= 1/3$, found in numerical lattice studies by Hamber. This suggests the fixed point may be physical while solving the cosmological constant problem.

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