Stationary dark energy with a baryon-dominated era: solving the coincidence problem with a linear coupling
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 therefor...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
28 February 2002
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| In: |
Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2002, Jahrgang: 65, Heft: 6 |
| ISSN: | 1550-2368 |
| DOI: | 10.1103/PhysRevD.65.063508 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.65.063508 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.65.063508 
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| Verfasserangaben: | Domenico Tocchini-Valentini and Luca Amendola, Osservatorio Astronomico di Roma, Viale del Parco Mellini 84, 00136 Roma, Italy |
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| 245 | 1 | 0 | |a Stationary dark energy with a baryon-dominated era |b solving the coincidence problem with a linear coupling |c Domenico Tocchini-Valentini and Luca Amendola, Osservatorio Astronomico di Roma, Viale del Parco Mellini 84, 00136 Roma, Italy |
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| 520 | |a 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. | ||
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