Abstract
We propose a general class of interacting models in which the interaction between the cold dark matter component and is parametrized by an arbitrary function of the cosmic scale factor . Differently from other dynamical scenarios in which the final stage of cosmic expansion is a de Sitter phase, we find solutions of transient acceleration, in which the -dark matter interaction will drive the Universe to a new dark matter-dominated era in the future. We investigate some cosmological consequences of this model and discuss some constraints on its parameters from current Type Ia aupernovae, baryonic acoustic oscillations, CMB, and data.
- Received 5 October 2009
DOI:https://doi.org/10.1103/PhysRevD.81.043506
©2010 American Physical Society