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arXiv 1711.03389gr-qcastro-ph.COhep-th
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暴胀Gauss-Bonnet修正引力的自治动力系统方法

Autonomous Dynamical System Approach for Inflationary Gauss-Bonnet Modified Gravity

V. K. Oikonomou

摘要:

本文将在相应的动力系统是自治的情况下,分析$f(\mathcal{G})$重力相空间。为了使动力系统自治,我们将适当地选择自变量,我们将数值分析变量的演化,重点是暴胀吸引子。正如我们所证明的,动力系统只有一个de Sitter不动点,这是不稳定的,与不稳定性被跟踪在一个独立的变量。这个结果在存在和不存在物质和辐射理想流体的情况下都成立。我们认为,这种不稳定性可以松散地被视为一个优雅的退出的指示,在引力的$f(\mathcal{G})$理论。

英文摘要:

In this paper we shall analyze the $f(\mathcal{G})$ gravity phase space, in the case that the corresponding dynamical system is autonomous. In order to make the dynamical system autonomous, we shall appropriately choose the independent variables, and we shall analyze the evolution of the variables numerically, emphasizing on the inflationary attractors. As we demonstrate, the dynamical system has only one de Sitter fixed point, which is unstable, with the instability being traced in one of the independent variables. This result holds true both in the presence and in the absence of matter and radiation perfect fluids. We argue that this instability could loosely be viewed as an indication of graceful exit in the $f(\mathcal{G})$ theory of gravity.

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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