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arXiv 0704.3121astro-phgr-qchep-phhep-th
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混合Chaobergin气体和幻影鸿沟跨越

Hybrid Chaplygin gas and phantom divide crossing

Hongsheng Zhang, Zong-Hong Zhu, Lihua Yang

摘要:

提出了混合Chaubergin气体模型,其中气体起着暗能量的作用。对于这个模型的重合问题大大缓解。暗能量的有效物态方程可能会跨越幻象分界线$w=-1$。此外,交叉行为与任何引力理论无关。在本模型中,$w<-1$只是一种瞬态行为。在未来的无穷远处存在一个德西特吸引子。因此,常困扰有效物态方程小于-1的物质模型的大撕裂奇点自然消失了。在早期宇宙和晚期宇宙都存在稳定的标度解。我们讨论了这个模型的扰动增长。我们发现,该指数是与观察一致。

英文摘要:

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 behaviour is decoupled from any gravity theories. In the present model, $w<-1$ is only a transient behaviour. 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, is naturally disappear. 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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