Interacting quintessence solution to the coincidence problem

Details Interacting quintessence solution to the coincidence problem Interacting quintessence solution to the coincidence problem

2003-03-06

arxiv.org/abs/astro-ph/0303145v1

Phys.Rev. D67 (2003) 083513

Astronomy and Astrophysics

Astrophysics

29 pages, RevTeX 4, 5 figures, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.67.083513

We show that a suitable interaction between a scalar field and a matter fluid in a spatially homogeneous and isotropic spacetime can drive the transition from a matter dominated era to an accelerated expansion phase and simultaneously solve the coincidence problem of our present Universe. For this purpose we study the evolution of the energy density ratio of these two components. We demonstrate that a stationary attractor solution is compatible with an accelerated expansion of the Universe. We extend this study to account for dissipation effects due to interactions in the dark matter fluid. Finally, Type Ia supernovae and primordial nucleosynthesis data are used to constrain the parameters of the model.

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