Revisiting the Cosmological Constraints on the Interacting Dark Energy Models

Abstract

In this work, we consider the cosmological constraints on the interacting dark energy models. We generalize the models considered previously by Guo {\it et al.}, Costa and Alcaniz, and try to discuss two general types of models: type I models are characterized by ${\rho }_{{}_X}/{\rho }_m=f(a)$ and $f(a)$ can be any function of scale factor $a$, whereas type II models are characterized by ${\rho }_m={\rho }_{m0}{a}^{-3+\epsilon (a)}$ and $\epsilon (a)$ can be any function of $a$. We obtain the cosmological constraints on the type I and II models with power-law, CPL-like, logarithmic $f(a)$ and $\epsilon (a)$ by using the latest observational data.

arXiv comment15 pages, 1 table, 6 figures, revtex4; v2: discussions added, Phys. Lett. B in press; v3: published version

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