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arXiv 1302.2210hep-th
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四维因果动态三角剖分的传递矩阵法

The transfer matrix method in four-dimensional causal dynamical triangulations

J. Ambjorn, J. Gizbert-Studnicki, A. T. Goerlich, J. Jurkiewicz, R. Loll

摘要:

量子引力的因果动力学三角剖分模型(CDT)是一个利用具有离散真时的格点正则化方法计算时空几何上的路径积分的命题。该模型承认一个威克旋转虚时间的每一个时空配置。利用计算机模拟,我们确定了该模型的相结构,并发现它预测了一个德西特相与四维球形半经典背景几何。该模型有一个传递矩阵,相关的空间几何形状在相邻(离散晶格)的时间。传递矩阵唯一地确定理论。我们表明,(CDT)宇宙的尺度因子的测量是很好地描述了一个有效的传输矩阵,其中的矩阵元素标记的尺度因子。使用计算机模拟,我们确定有效的传输矩阵元素,并显示它们如何在所有尺度上与有效的minisuperspace行动。

英文摘要:

The Causal Dynamical Triangulation model of quantum gravity (CDT) is a proposition to evaluate the path integral over space-time geometries using a lattice regularization with a discrete proper time and geometries realized as simplicial manifolds. The model admits a Wick rotation to imaginary time for each space-time configuration. Using computer simulations we determined the phase structure of the model and discovered that it predicts a de Sitter phase with a four-dimensional spherical semi-classical background geometry. The model has a transfer matrix, relating spatial geometries at adjacent (discrete lattice) times. The transfer matrix uniquely determines the theory. We show that the measurements of the scale factor of the (CDT) universe are well described by an effective transfer matrix where the matrix elements are labelled only by the scale factor. Using computer simulations we determine the effective transfer matrix elements and show how they relate to an effective minisuperspace action at all scales.

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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