arXiv 0909.22192009-09hep-thastro-ph.COgr-qc

Horava-Lifshitz宇宙学的相空间分析

An analysis of the phase space of Horava-Lifshitz cosmologies

Sante Carloni, Emilio Elizalde, Pedro J. Silva

备注：: 12 pages, some typos corrected, some references added
DOI：: 10.1088/0264-9381/27/4/045004

摘要：

利用动力系统方法，系统地研究了基于Horava-Lifshitz引力的宇宙学模型的性质.特别是，宇宙相空间的Horava-Lifshitz模型的特点。分析允许比较施加（或不施加）细致平衡的一些关键物理后果。研究的结果是，在细致平衡的情况下，理论中的吸引子之一对应于振荡行为。这种振荡可以与布兰登伯格先前描述的弹跳宇宙相关联，并将阻止向德西特宇宙演化的可能性。其他结果表明，在没有细致平衡假设的情况下，Horava-Lifshitz引力模型确实有可能描述Friedmann时代和暗能量时代之间的过渡.整个分析得出一个似乎合理的结论，即只有当细致平衡条件被打破时，才能获得与当前宇宙观测相一致的宇宙学。

英文摘要：

Using the dynamical system approach, properties of cosmological models based on the Horava-Lifshitz gravity are systematically studied. In particular, the cosmological phase space of the Horava-Lifshitz model is characterized. The analysis allows to compare some key physical consequences of the imposition (or not) of detailed balance. A result of the investigation is that in the detailed balance case one of the attractors in the theory corresponds to an oscillatory behavior. Such oscillations can be associated to a bouncing universe, as previously described by Brandenberger, and will prevent a possible evolution towards a de Sitter universe. Other results obtained show that the cosmological models generated by Horava-Lifshitz gravity without the detailed balance assumption have indeed the potential to describe the transition between the Friedmann and the dark energy eras. The whole analysis leads to the plausible conclusion that a cosmology compatible with the present observations of the universe can be achieved only if the detailed balance condition is broken.

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