Graviton fluctuations erase the cosmological constant
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 s...
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| Autore principale: | |
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| Natura: | Article (Journal) Chapter/Article |
| Lingua: | inglese |
| Pubblicazione: |
Apr 26, 2017
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| In: |
Arxiv
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| Accesso online: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1704.08040 Verlag, kostenfrei, Volltext: http://arxiv.org/pdf/1704.08040.pdf 
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| Note sull'autore: | C. Wetterich |
| Riassunto: | 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 we find that the potential increases asymptotically at most quadratically with the scalar field. With effective Planck mass proportional to 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. |
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| Descrizione del documento: | Gesehen am 13.07.2017 |
| Descrizione fisica: | Online Resource |