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arXiv 0708.3237gr-qcastro-phhep-ph
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Einstein-Gauss-Bonnet引力中的膜世界动力学

Braneworld dynamics in Einstein-Gauss-Bonnet gravity

Hideki Maeda, Varun Sahni, Yuri Shtanov

摘要:

本文讨论了在五维Gauss-Bonnet引力中膜世界的宇宙学演化。我们的讨论允许第五维(体)是类空间和类时间。由此得到的运动方程在(H^2,(ρ+σ)^2)平面上具有三次方程的形式,其中σ是膜张力,ρ是物质密度。这使我们能够对高斯-邦纳膜的宇宙演化进行全面的图像分析。这个膜世界有许多有趣的性质,包括在晚期加速膨胀的可能性。对于参数空间中的有限区域,加速膨胀可以是幻影状的,使得w <-1。在后期,该分支接近de Sitter空间(w = -1),并避免了通常存在于体模模型中的大裂缝奇点。对于一个类时额外维度,高斯-邦纳膜可以反弹并避免初始奇点。

英文摘要:

We discuss the cosmological evolution of a braneworld in five dimensional Gauss-Bonnet gravity. Our discussion allows the fifth (bulk) dimension to be space-like as well as time-like. The resulting equations of motion have the form of a cubic equation in the (H^2,(ρ+σ)^2) plane, where σis the brane tension and ρis the matter density. This allows us to conduct a comprehensive pictorial analysis of cosmological evolution for the Gauss-Bonnet brane. The many interesting properties of this braneworld include the possibility of accelerated expansion at late times. For a finite region in parameter space the accelerated expansion can be phantom-like so that w < -1. At late times, this branch approaches de Sitter space (w = -1) and avoids the big-rip singularities usually present in phantom models. For a time-like extra dimension the Gauss-Bonnet brane can bounce and avoid the initial singularity.

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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