Emergent scale symmetry: Connecting inflation and dark energy
Quantum gravity computations suggest the existence of an ultraviolet and an infrared fixed point where quantum scale invariance emerges as an exact symmetry. We discuss a particular variable gravity model for the crossover between these fixed points which can naturally account for inflation and dark...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
13 September 2017
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| In: |
Physical review
Year: 2017, Volume: 96, Issue: 6, Pages: 063509 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.96.063509 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.96.063509 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.96.063509 
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| Author Notes: | Javier Rubio and Christof Wetterich |
| Summary: | Quantum gravity computations suggest the existence of an ultraviolet and an infrared fixed point where quantum scale invariance emerges as an exact symmetry. We discuss a particular variable gravity model for the crossover between these fixed points which can naturally account for inflation and dark energy, using a single scalar field. In the Einstein-frame formulation, the potential can be expressed in terms of Lambert functions, interpolating between a power-law inflationary potential and a mixed-quintessence potential. For two natural heating scenarios, the transition between inflation and radiation domination proceeds through a “graceful reheating” stage. The radiation temperature significantly exceeds the temperature of big bang nucleosynthesis. For this type of model, the observable consequences of the heating process can be summarized in a single parameter, the heating efficiency. Our quantitative analysis of compatibility with cosmological observations reveals the existence of realistic models able to describe the whole history of the Universe using only a single metric and scalar field and involving just a small number of order 1 parameters. |
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| Item Description: | Gesehen am 22.09.2017 |
| Physical Description: | Online Resource |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.96.063509 |