Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-08-08
Phys.Rev. D65 (2002) 063508
Astronomy and Astrophysics
Astrophysics
7 pages, submitted to Phys. Rev.. v2: several changes in the discussion of the perturbation growth and the CMB. Conclusions un
Scientific paper
10.1103/PhysRevD.65.063508
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 accomodate 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.
Amendola Luca
Tocchini-Valentini Domenico
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