Stationary dark energy with a baryon-dominated era

• Verfasst von: Tocchini-Valentini, Domenico [VerfasserIn]
• Verfasst von: Amendola, Luca [VerfasserIn]
• Titel: Stationary dark energy with a baryon-dominated era
• Titelzusatz: solving the coincidence problem with a linear coupling
• Verf.angabe: Domenico Tocchini-Valentini and Luca Amendola, Osservatorio Astronomico di Roma, Viale del Parco Mellini 84, 00136 Roma, Italy
• Fussnoten: Gesehen am 17.11.2017
• Titel Quelle: Enthalten in: Physical review / D
• Jahr Quelle: 2002
• Band/Heft Quelle: 65(2002,6) Artikel-Nummer 06350, 6 Seiten
• ISSN Quelle: 1550-2368
• ISSN Quelle: 1089-4918
• DOI: doi:10.1103/PhysRevD.65.063508
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565454006

Abstract

We show that all cosmological models with an accelerated stationary global attractor reduce asymptotically to a dark energy field with an exponential potential coupled linearly to a perfect fluid dark matter. In such models the abundance of the dark components reaches a stationary value and therefore the problem of their present coincidence is solved. The requirement of a vanishing coupling of the baryons in order to pass local gravity experiments induces the existence of an intermediate baryon-dominated era. We discuss in detail the properties of these models and show that to accommodate standard nucleosynthesis they cannot produce a microwave background consistent with observations. We conclude that, among stationary models, only a time-dependent coupling or equation of state might provide a realistic cosmology.