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An interesting and well presented new paper by Kumar and Xu:
"Observational constraints on a cosmological model with variable equation of state parameters for matter and dark energy" http://arxiv.org/abs/1207.5582
The idea of a variable equation of state for matter and dark energy is not revolutionary - e.g, "Cosmological model with variable equations of state for matter and dark energy" http://arxiv.org/abs/1204.0589 by Ponce de Leon. I find the continuity and consistency with observational evidence in modeling effects from high z to the modern era appealing.
"Observational constraints on a cosmological model with variable equation of state parameters for matter and dark energy" http://arxiv.org/abs/1207.5582
The idea of a variable equation of state for matter and dark energy is not revolutionary - e.g, "Cosmological model with variable equations of state for matter and dark energy" http://arxiv.org/abs/1204.0589 by Ponce de Leon. I find the continuity and consistency with observational evidence in modeling effects from high z to the modern era appealing.