Multigraph models for causal quantum gravity and scale dependent spectral dimension
Multigraph models for causal quantum gravity and scale dependent spectral dimension
复制标题
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:
影响因子:
--
通讯作者:
Giasemidis G
中科院分区:
文献类型:
--
作者:
Giasemidis G
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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DOI:
10.1016/s0550-3213(98)00692-0
发表时间:
1998-05
期刊:
Nuclear Physics
影响因子:
--
作者:
J. Ambjorn;R. Loll
通讯作者:
J. Ambjorn;R. Loll
影响因子:
5
作者:
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通讯作者:
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DOI:
10.1017/cbo9780511524417.007
发表时间:
1997
期刊:
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影响因子:
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作者:
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通讯作者:
J. Ambjorn;B. Durhuus;T. Jonsson
DOI:
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发表时间:
1997
期刊:
影响因子:
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作者:
T. Jonsson;J. Wheater
通讯作者:
J. Wheater
DOI:
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发表时间:
2006
期刊:
影响因子:
--
作者:
B. Durhuus;T. Jonsson;J. Wheater
通讯作者:
J. Wheater