期刊
PHYSICS LETTERS B
卷 773, 期 -, 页码 6-19出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2017.08.002
关键词
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资金
- ERC [290623]
- DFG Collaborative Research Centre [SFB 1225]
- European Research Council (ERC) [290623] Funding Source: European Research Council (ERC)
Graviton fluctuations induce strong non-perturbative infrared renormalization effects for the cosmological constant. The functional renormalization flow drives a positive cosmological constant towards zero, solving the cosmological constant problem without the need to tune parameters. We propose a simple computation of the graviton contribution to the flow of the effective potential for scalar fields. Within variable gravity, with effective Planck mass proportional to the scalar field, we find that the potential increases asymptotically at most quadratically with the scalar field. The solutions of the derived cosmological equations lead to an asymptotically vanishing cosmological constant in the infinite future, providing for dynamical dark energy in the present cosmological epoch. Beyond a solution of the cosmological constant problem, our simplified computation also entails a sizeable positive graviton-induced anomalous dimension for the quartic Higgs coupling in the ultraviolet regime, substantiating the successful prediction of the Higgs boson mass within the asymptotic safety scenario for quantum gravity. (C) 2017 The Author(s). Published by Elsevier B.V.
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