Multigraph models for causal quantum gravity and scale dependent spectral dimension

Multigraph models for causal quantum gravity and scale dependent spectral dimension
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因果量子引力和尺度相关光谱维度的多图模型

DOI:
10.1088/1751-8113/45/35/355001
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发表时间:
2012
期刊:
Mathematical and Theoretical
影响因子:
--
通讯作者:
Giasemidis G
Giasemidis G
中科院分区:
--
文献类型:
--
作者:
Giasemidis G

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我们研究了一类特定的随机多重图的集合上的随机游动,这类随机多重图为量子引力的因果动力学三角测量(CDT)模型提供了一个“有效的图集合”。特别是,我们调查的谱维数的多重图合奏经常性以及瞬态行走。我们调查的情况下,谱维数和Hausdorff维数是相等的,并表明,这种情况发生时,ρ,指数的反常行为的阻力无穷大,是零。在这些模型中引入了尺度相关谱维的概念。我们将这一概念应用到多重图系综的大小有偏的临界Galton-Watson过程,其中有一个尺度依赖的谱维数在大尺度上为2,在小尺度上为1。最后,我们讨论了一个具体的模型相关的四维CDT具有光谱维度的4在大尺度和2在小尺度。
We study random walks on ensembles of a specific class of random multigraphs which provide an'effective graph ensemble'for the causal dynamical triangulation (CDT) model of quantum gravity. In particular, we investigate the spectral dimension of the multigraph ensemble for recurrent as well as transient walks. We investigate the circumstances in which the spectral dimension and Hausdorff dimension are equal and show that this occurs when ρ, the exponent for anomalous behaviour of the resistance to infinity, is zero. The concept of scale dependent spectral dimension in these models is introduced. We apply this notion to a multigraph ensemble with a measure induced by a size biased critical Galton–Watson process which has a scale dependent spectral dimension of two at large scales and one at small scales. We conclude by discussing a specific model related to four dimensional CDT which has a spectral dimension of four at large scales and two at small scales.
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