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arXiv 0908.1150gr-qcastro-ph.COhep-th
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广义Gauss-Bonnet暗能量的相空间

The phase-space of generalized Gauss-Bonnet dark energy

M. Alimohammadi, A. Ghalee

摘要:

由拉格朗日F(R,G)引入的广义Gauss-Bonnet理论被认为是解释暗能量的广义修正引力。G是Gauss-Bonnet不变量。对于这个模型,我们寻求的情况下,该理论的后期时间行为是de-Sitter时空。这是通过研究该理论的二维相空间,即R-H平面来完成的。通过得到de-Sitter时空是该理论稳定吸引子的条件,对该问题的几个方面进行了研究。它已被证明存在至少两类稳定的吸引子:F(R,G)的奇异性,以及在该模型中有一个临界曲线,而不是临界点的情况。在R-H平面上,该曲线为R=12H^2。讨论了几个例子,包括它们的数值计算。

英文摘要:

The generalized Gauss-Bonnet theory, introduced by Lagrangian F(R,G), has been considered as a general modified gravity for explanation of the dark energy. G is the Gauss-Bonnet invariant. For this model, we seek the situations under which the late-time behavior of the theory is the de-Sitter space-time. This is done by studying the two dimensional phase space of this theory, i.e. the R-H plane. By obtaining the conditions under which the de-Sitter space-time is the stable attractor of this theory, several aspects of this problem have been investigated. It has been shown that there exist at least two classes of stable attractors : the singularities of the F(R,G), and the cases in which the model has a critical curve, instead of critical points. This curve is R=12H^2 in R-H plane. Several examples, including their numerical calculations, have been discussed.

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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