• DOI:10.1142/S0217732309027303
• Corpus ID: 119321011

HYBRID CHAPLYGIN GAS

@article{Zhang2009HYBRIDCG,
  title={HYBRID CHAPLYGIN GAS},
  author={Hongsheng Zhang and Zong-hong Zhu and Lihua Yang},
  journal={Modern Physics Letters A},
  year={2009},
  volume={24},
  pages={541-555}
}

• Hongsheng Zhang, Zong-hong Zhu, Lihua Yang
• Published 24 April 2007
• Physics
• Modern Physics Letters A

Hybrid Chaplygin gas model is put forward, in which the gases play the role of dark energy. For this model the coincidence problem is greatly alleviated. The effective equation of state of the dark energy may cross the phantom divide w = -1. Furthermore, the crossing behavior is decoupled from any gravity theories. In the present model, w < -1 is only a transient behavior. There is a de Sitter attractor in the future infinity. Hence, the big rip singularity, which often afflicts the models with matter whose effective equation of state less than -1, naturally disappears. There exist stable scaling solutions, both at the early universe and the late universe. We discuss the perturbation growth of this model. We find that the index is consistent with observations.