Non-flat universe and interacting dark energy model

Abstract

For non-flat universe of $k\ne 0$, we investigate a model of the interacting holographic dark energy with cold dark matter (CDM). There exists a mixture of two components arisen from decaying of the holographic dark energy into CDM. In this case we use the effective equations of state (${\omega }_{\mathrm{\Lambda }}^{\mathrm{eff}},{\omega }_{\mathrm{m}}^{\mathrm{eff}}$) instead of the native equations of state (${\omega }_{\mathrm{\Lambda }},{\omega }_{\mathrm{m}})$. Consequently, we show that interacting holographic energy models in non-flat universe cannot accommodate a transition from the dark energy to the phantom regime.

12 pages, 4 figures, version to appear in PLB