Phase-space analysis on interactions in dark energy models

摘要

To alleviate the “cosmic triple coincidence” problem, we add two kinds of interacting term in scalar field models which make radiation, matter and dark energy causally connected. Specifically, the interacting term ((varGammadot{phi}^{2})) is being used in dark energy models for the first time. By the phase-space analysis, the evolution of our universe is investigated. We find that the eigenvalues in the radiation dominated phases could be all positive and the interactions help alleviate the “cosmic triple coincidence” problem in quintessence model.