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arXiv 0905.1468hep-th
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非最小修正Gauss-Bonnet引力中的宇宙加速和$ω=-1$穿越

Cosmic acceleration and crossing of $ω=-1$ in non-minimal modified Gauss-Bonnet gravity

J Sadeghi, M R Setare, A Banijamali

摘要:

修正的Gauss-Bonnet引力,即$f(G)$引力是暗能量的一种可能的解释。文献[32]研究了与无质量标量场非最小耦合的$f(G)$引力的晚期宇宙学。本文推广了文献[32]的工作,在物质拉格朗日量中加入标量势,使之与修正的Gauss-Bonnet引力非极小耦合。我们还得到了一个比宇宙加速度更令人惊奇的问题的条件,即:在与速子拉格朗日量非极小耦合的$f(G)$中,$ω=-1$的穿越。

英文摘要:

Modified Gauss-Bonnet, i.e, $f(G)$ gravity is a possible explanation of dark energy. Late time cosmology for the $f(G)$ gravity non-minimally coupled with a free massless scalar field have been investigated in Ref. [32]. In this paper we generalize the work of Ref. [32] by including scalar potential in the matter Lagrangian which is non-minimally coupled with modified Gauss-Bonnet gravity. Also we obtain the conditions for having a much more amazing problem than the acceleration of the universe, i.e: crossing of $ω=-1$, in $f(G)$ non-minimally coupled with tachyonic Lagrangian.

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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