Accelerating cosmologies in the Einstein-Gauss-Bonnet theory with a dilaton
Accelerating cosmologies in the Einstein-Gauss-Bonnet theory with a dilaton
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DOI：
10.1143/ptp.118.879
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发表时间：
2007-11-01
影响因子：
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通讯作者：
Ohta, Nobuyoshi
中科院分区：
文献类型：
--
作者：
Bamba, Kazuharu;Guo, Zong-Kuan;Ohta, Nobuyoshi
我们研究了低能有效杂化弦理论中的宇宙学解，该理论由带有Gauss-Bonnet项的爱因斯坦引力和一个伸缩子组成。我们证明了对于平坦的内外空间，场方程具自治系统的形式，并导出了该系统的所有不动点。我们还研究了解的时间演化，以及解是否可以在爱因斯坦框架下描述我们的四维空间的(瞬时)加速膨胀的问题。
We study cosmological solutions in low-energy effective heterotic string theory, which consists of the Einstein gravity with the Gauss-Bonnet term and a dilaton. We show that the field equations take the form of an autonomous system for flat internal and external spaces, and we derive all the fixed points in the system. We also examine the time evolution of the solutions and the question of whether the solutions can describe (transient) accelerated expansion of our four-dimensional space in the Einstein frame.