Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-11-02
JCAP 0503 (2005) 002
Physics
High Energy Physics
High Energy Physics - Theory
Latex, 17 pages including 14 figures, minor changes
Scientific paper
10.1088/1475-7516/2005/03/002
We study a cosmological model in which phantom dark energy is coupled to dark matter by phenomenologically introducing a coupled term to the equations of motion of dark energy and dark matter. This term is parameterized by a dimensionless coupling function $\delta$, Hubble parameter and the energy density of dark matter, and it describes an energy flow between the dark energy and dark matter. We discuss two cases: one is the case where the equation-of-state $\omega_e$ of the dark energy is a constant; the other is that the dimensionless coupling function $\delta$ is a constant. We investigate the effect of the interaction on the evolution of the universe, the total lifetime of the universe, and the ratio of the period when the universe is in the coincidence state to its total lifetime. It turns out that the interaction will produce significant deviation from the case without the interaction.
Cai Rong-Gen
Wang Anzhong
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