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arXiv 0908.3643math-phhep-thmath.MPmath.PR
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因果三角剖分的谱维数

On the spectral dimension of causal triangulations

Bergfinnur Durhuus, Thordur Jonsson, John F. Wheater

摘要:

我们介绍了一个合奏的无限因果三角形,称为统一的无限因果三角形,并表明它是等价的合奏的无限树,统一的无限平面树。证明了在这两种情况下Hausdorff维数几乎必然等于2。无限因果三角形几乎肯定是经常性的,或者等价地,它们的谱维数几乎肯定小于或等于2。我们还建立了某些减少版本的无限因果三角的谱维数等于2的合奏平均,几乎肯定。我们考虑的三角形系综等价于二维量子引力的因果动力学三角形模型,因此我们的结果适用于该模型。

英文摘要:

We introduce an ensemble of infinite causal triangulations, called the uniform infinite causal triangulation, and show that it is equivalent to an ensemble of infinite trees, the uniform infinite planar tree. It is proved that in both cases the Hausdorff dimension almost surely equals 2. The infinite causal triangulations are shown to be almost surely recurrent or, equivalently, their spectral dimension is almost surely less than or equal to 2. We also establish that for certain reduced versions of the infinite causal triangulations the spectral dimension equals 2 both for the ensemble average and almost surely. The triangulation ensemble we consider is equivalent to the causal dynamical triangulation model of two-dimensional quantum gravity and therefore our results apply to that 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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