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arXiv 0811.0558gr-qc
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关于存在Gauss-Bonnet项时(4+1)维和(5+1)维各向异性宇宙学的区别的注记

A note on differences between (4+1)- and (5+1)-dimensional anisotropic cosmology in the presence of the Gauss-Bonnet term

S. A. Pavluchenko, A. V. Toporensky

摘要:

研究了一个在作用量中除了通常的爱因斯坦项外还含有Gauss-Bonnet(GB)贡献的平坦各向异性(5+1)维宇宙模型。与(4+1)维情况进行了比较,发现相应的宇宙动力学性质有很大的不同.这种差异表现在模型从GB项主导到Einstein项主导的平滑过渡的概率上-在初始条件空间上的合理度量下,这种概率对于(4+1)情况几乎为零,对于(5+1)情况约为60%。我们讨论这种差异以及所考虑的模型的动力学的一些功能。

英文摘要:

We investigate a flat anisotropic (5+1)-dimensional cosmological model in the presence of the Gauss-Bonnet (GB) contribution in addition to usual Einstein term in the action. We compared it with (4+1)-dimensional case and found a substantial difference in corresponding cosmological dynamics. This difference is manifested in the probability of the model to have smooth transition from GB-term-dominated to Einstein-term-dominated phases--this probability in a reasonable measure on the initial condition space is almost zero for (4+1) case and about 60% for (5+1) case. We discuss this difference as well as some features of the dynamics of the considered model.

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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