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arXiv 0904.1114astro-ph.CO
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统一暗物质和暗能量的DBI模型

DBI models for the unification of dark matter and dark energy

Luis P. Chimento, Ruth Lazkoz, Irene Sendra

摘要:

我们提出了一个基于DBI作用量的暗物质和暗能量统一模型。这一点得到了早期和晚期背景行为研究结果的支持,并通过对扰动演化的分析得到了加强。我们还进行了贝叶斯分析,以设置观测约束的模型参数,使用类型Ia SN,CMB移位和BAO数据。最后,为了完成研究,我们研究了它的运动学方面,如有效状态方程参数,加速度参数和跃迁红移。为了获得最佳拟合,将这些参数具体化,优选有效体模。

英文摘要:

We propose a model based on a DBI action for the unification of dark matter and dark energy. This is supported by the results of the study of its background behavior at early and late times, and reinforced by the analysis of the evolution of perturbations. We also perform a Bayesian analysis to set observational constraints on the parameters of the model using type Ia SN, CMB shift and BAO data. Finally, to complete the study we investigate its kinematics aspects, such as the effective equation of state parameter, acceleration parameter and transition redshift. Particularizing those parameters for the best fit one appreciates that an effective phantom is preferred.

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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