Observational H(z) data and cosmological models

In this work, we confront ten cosmological models with observational H(z) data. The possible interaction between dark energy and dust matter is allowed in some of these models. Also, we consider the possibility of (effective) equation-of-state parameter (EoS) crossing -1. We find that the best models have an oscillating feature for both H(z) and EoS, with the EoS crossing -1 around redshift z similar to 1.5. (c) 2006 Elsevier B.V. All rights reserved.