Agegraphic Dark Energy with the Sign-Changeable Interaction in Non-Flat Universe**Supported by National Nature Science Foundation of China under Grant No. 51405181, Natural Science Foundation for Youths of Jiangsu Province under Grant No. BK20130407, and Colleges and Universities Natural Science Fundation of Jiangsu Province under Grant No. 13KJB460001

Abstract

In this paper, we investigate the agegraphic dark energy (ADE) model by including the sign-changeable interaction between ADE and dark matter in non-flat universe. The interaction Q can change its sign from Q < 0 to Q > 0 as the universe expands. This indicates that at first dark matter decays to ADE, and then ADE decays to dark matter. We study the dynamical behavior of the model by using the phase-plane analysis. It is shown numerically that the coupling constant β plays an important role in the evolution of the universe. The equation of state (EoS) of ADE with the sign-changeable interaction is more likely to cross the phantom divide wd = −1 from top to bottom with the increasing of the |β|. Whereas in ADE model with usual interaction, wd can cross the phantom divide from bottom to top. We also find that our model is consistent with the observational data.