Transition of the dark energy equation of state in an interacting holographic dark energy model

Abstract

A model of holographic dark energy with an interaction with matter fields has been investigated. Choosing the future event horizon as an IR cutoff, we have shown that the ratio of energy densities can vary with time. With the interaction between the two different constituents of the universe, we observed the evolution of the universe, from early deceleration to late time acceleration. In addition, we have found that such an interacting dark energy model can accommodate a transition of the dark energy from a normal state where $w_D>-1$ to $w_D<-1$ phantom regimes. Implications of interacting dark energy model for the observation of dark energy transition has been discussed.

Figures (5)

• Figure 1: Evolution of the DE for a fixed interaction parameter with DM ($b^2$) but for different values of the constant $c$.
• Figure 2: Evolution of the DE with a fixed constant $c$ but different values for the coupling with DM.
• Figure 3: Dependence of the deceleration parameter on the constant $c$ for a fixed coupling between DE and DM.
• Figure 4: Dependence of the deceleration parameter on the coupling between DE and DM for a fixed constant $c$.
• Figure 5: Behavior of the equation of state of DE for different couplings between DE and DM.