Infrared limit of quantum gravity
We explore the infrared limit of quantum gravity in the presence of a cosmological constant or effective potential for scalar fields. For a positive effective scalar potential, one-loop perturbation theory around flat space is divergent due to an instability of the graviton propagator. Functional re...
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| Main Author: | |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
25 July 2018
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| In: |
Physical review
Year: 2018, Volume: 98, Issue: 3 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.98.026028 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.98.026028 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.98.026028 
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| Author Notes: | C. Wetterich, Institut für Theoretische Physik, Universität Heidelberg |
MARC
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| 520 | |a We explore the infrared limit of quantum gravity in the presence of a cosmological constant or effective potential for scalar fields. For a positive effective scalar potential, one-loop perturbation theory around flat space is divergent due to an instability of the graviton propagator. Functional renormalization solves this problem by a flow of couplings avoiding instabilities. This leads to a graviton barrier limiting the maximal growth of the effective potential for large values of scalar fields. In the presence of this barrier, variable gravity with a field dependent Planck mass can solve the cosmological constant problem by a cosmological runaway solution. We discuss the naturalness of tiny values of the cosmological constant and cosmon mass due to a strong attraction towards an infrared fixed point. | ||
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