Cosmological consequences of a possible $Λ$-dark matter interaction

Details Cosmological consequences of a possible $Λ$-dark matter interaction Cosmological consequences of a possible $Λ$-dark matter interaction

2009-08-28

arxiv.org/abs/0908.4251v1

Phys.Rev.D81:043506,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 5 figures, LaTeX

Scientific paper

10.1103/PhysRevD.81.043506

We propose a general class of interacting models in which the interaction between the CDM component and $\Lambda$ is parameterized by an arbitrary function of the cosmic scale factor $\epsilon(a)$. Differently from other dynamical $\Lambda$ scenarios in which the final stage of cosmic expansion is a de Sitter phase, we find solutions of transient acceleration, in which the $\Lambda$-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 SNe Ia, BAO, CMB and $H_0$ data.

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