Revisiting the Cosmological Constraints on the Interacting Dark Energy Models

TL;DR

This paper explores cosmological constraints on generalized interacting dark energy models, analyzing two types with flexible functions of scale factor, using recent observational data to refine understanding of dark energy interactions.

Contribution

It introduces a generalized framework for interacting dark energy models with flexible functions, extending previous models and applying observational data for constraints.

Findings

Constraints on type I models with various $f(a)$ functions.

Constraints on type II models with different $ ho_m$ evolution functions.

Improved bounds on dark energy interaction parameters.

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.