Emergent scale symmetry

• Verfasst von: Rubio, Javier [VerfasserIn]
• Verfasst von: Wetterich, Christof [VerfasserIn]
• Titel: Emergent scale symmetry
• Titelzusatz: Connecting inflation and dark energy
• Verf.angabe: Javier Rubio and Christof Wetterich
• Fussnoten: Gesehen am 22.09.2017
• Titel Quelle: Enthalten in: Physical review
• Jahr Quelle: 2017
• Band/Heft Quelle: 96(2017,6) Artikel-Nummer 063509, 20 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.96.063509
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1563730928

Abstract

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 theexistence 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.