Interacting Energy Components and Observational $H(z)$ Data

TL;DR

This paper compares eleven interacting dark energy models with observational H(z) data and finds none outperform the standard Lambda-CDM model, suggesting no interaction or the need for more exotic couplings.

Contribution

The study extends previous work by testing multiple interacting dark energy models against observational data, highlighting their lack of superiority over Lambda-CDM.

Findings

None of the interacting models outperform Lambda-CDM.

Exotic couplings may be necessary for interaction models.

Results challenge the viability of current interacting dark energy models.

Abstract

In this note, we extend our previous work [Phys. Lett. B 644, 7 (2007), astro-ph/0609597], and compare eleven interacting dark energy models with different couplings to the observational $H(z)$ data. However, none of these models is better than the simplest $\Lambda$CDM model. This implies that either more exotic couplings are needed in the cosmological models with interaction between dark energy and dust matter, or {\em there is no interaction at all}. We consider that this result is disadvantageous to the interacting dark energy models studied extensively in the literature.