Stationary dark energy: the present universe as a global attractor

Details Stationary dark energy: the present universe as a global attractor Stationary dark energy: the present universe as a global attractor

2000-11-13

arxiv.org/abs/astro-ph/0011243v2

Phys.Rev.D64:043509,2001

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, submitted to Phys. Rev. Lett. Minor revision (added some refs, shortened to match PRL requirements)

Scientific paper

10.1103/PhysRevD.64.043509

We propose a cosmological model that makes a significant step toward solving the coincidence problem of the near similarity at the present of the dark energy and dark matter components. Our cosmology has the following properties: a) among flat and homogeneous spaces, the present universe is a global attractor: all the possible initial conditions lead to the observed proportion of dark energy and dark matter; once reached, it remains fixed forever; b) the expansion is accelerated at the present, as requested by the supernovae observations; c) the model is consistent with the large-scale structure and microwave background data; d) the dark energy and the dark matter densities always scale similarly after equivalence and are close to within two orders of magnitude. The model makes use of a non-linear coupling of the dark energy to the dark matter that switches on after structure formation.

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