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Scaling solutions for dilaton quantum gravity

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Scaling solutions for the effective action in dilaton quantum gravity are investigated within the functional renormalization group approach. We find numerical solutions that connect ultraviolet and infrared fixed points as the ratio between scalar field and renormalization scale $k$ is varied. In th...

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Hauptverfasser: Henz, Tobias (VerfasserIn) , Pawlowski, Jan M. (VerfasserIn) , Wetterich, Christof (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 30 January 2017
In: Physics letters
Year: 2017, Jahrgang: 769, Pages: 105-110
ISSN:1873-2445
DOI:10.1016/j.physletb.2017.01.057
Online-Zugang:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1016/j.physletb.2017.01.057
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Verfasserangaben:T. Henz, J.M. Pawlowski, C. Wetterich

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520 |a Scaling solutions for the effective action in dilaton quantum gravity are investigated within the functional renormalization group approach. We find numerical solutions that connect ultraviolet and infrared fixed points as the ratio between scalar field and renormalization scale $k$ is varied. In the Einstein frame the quantum effective action corresponding to the scaling solutions becomes independent of $k$. The field equations derived from this effective action can be used directly for cosmology. Scale symmetry is spontaneously broken by a non-vanishing cosmological value of the scalar field. For the cosmology corresponding to our scaling solutions, inflation arises naturally. The effective cosmological constant becomes dynamical and vanishes asymptotically as time goes to infinity. 
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