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arXiv 0711.3833gr-qc
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负宇宙学常数下的理想流体量子宇宙

Perfect fluid quantum Universe in the presence of negative cosmological constant

P. Pedram, M. Mirzaei, S. Jalalzadeh, S. S. Gousheh

摘要:

在负宇宙学常数的情况下,提出了理想流体Friedmann-Robertson-Walker量子宇宙学模型.在这项工作中,舒茨的变分形式主义适用于辐射,尘埃,宇宙弦,和畴壁为主的宇宙正,负,零常数空间曲率。在这种方法中,时间的概念可以恢复。这就产生了Wheeler-DeWitt方程的比例因子。用谱方法求出了它们的本征值和本征函数。在此之后,我们使用的特征函数,以构建波包为每种情况下,并评估的尺度因子,这被发现在有限的最大值和最小值之间振荡的时间依赖的期望值。由于尺度因子的期望值永远不会趋于奇点,我们有一个初步的迹象表明,这些模型可能没有在量子水平上的奇点。

英文摘要:

We present perfect fluid Friedmann-Robertson-Walker quantum cosmological models in the presence of negative cosmological constant. In this work the Schutz's variational formalism is applied for radiation, dust, cosmic string, and domain wall dominated Universes with positive, negative, and zero constant spatial curvature. In this approach the notion of time can be recovered. These give rise to Wheeler-DeWitt equations for the scale factor. We find their igenvalues and eigenfunctions by using Spectral Method. After that, we use the eigenfunctions in order to construct wave packets for each case and evaluate the time-dependent expectation value of the scale factors, which are found to oscillate between finite maximum and minimum values. Since the expectation values of the scale factors never tends to the singular point, we have an initial indication that these models may not have singularities at the quantum level.

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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