arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1910.04466physics.soc-phcond-mat.stat-mech
收藏

具有异质度数和层间耦合的多重网络模型中的局部相变

Local phase transitions in a model of multiplex networks with heterogeneous degrees and inter-layer coupling

Nedim Bayrakdar, Valerio Gemmetto, Diego Garlaschelli

AI总结:

本文提出无偏最大熵多重网络模型,映射到广义Ising模型,揭示节点异质性与层间耦合引发局部相变,从而分离虚假与真实相关性,并应用于International Trade Multiplex验证。

摘要:

多层网络表示同一组节点之间多种类型的连接。显然,只有当多重网络不仅仅由独立的层组成(即层间重叠是非平凡的)时,系统的多层描述才具有附加价值。在现实世界的多重网络中,观察到的重叠可能部分源于由节点异质性引起的虚假相关性,部分源于真实的相互依赖。然而,目前尚未开发出严格的方法来分离这两种效应。本文我们引入了一个无偏的最大熵多重网络模型,具有可控的节点度数和可控的重叠。该模型可映射到广义Ising模型,其中节点异质性和层间耦合的结合导致了局部相变的可能性。特别地,我们发现网络异质性的增加会导致不同节点对具有不同的临界点,这进而引发局部相变,最终可能增加重叠。该模型使我们能够量化重叠如何通过增加网络异质性(虚假相关)或层间耦合强度(真实相关)而增加,从而分离这两种效应。作为应用,我们展示了International Trade Multiplex中的经验重叠并非仅仅是不同层间节点度数相关的虚假结果,而是在其建模中需要非零的层间耦合。

英文摘要:

Multilayer networks represent multiple types of connections between the same set of nodes. Clearly, a multilayer description of a system adds value only if the multiplex does not merely consist of independent layers, i.e. if the inter-layer overlap is nontrivial. On real-world multiplexes, it is expected that the observed overlap may partly result from spurious correlations arising from the heterogeneity of nodes and partly from true interdependencies. However, no rigorous way to disentangle these two effects has been developed. In this paper we introduce an unbiased maximum-entropy model of multiplexes with controllable node degrees and controllable overlap. The model can be mapped to a generalized Ising model where the combination of node heterogeneity and inter-layer coupling leads to the possibility of local phase transitions. In particular, we find that an increased heterogeneity in the network results in different critical points for different pairs of nodes, which in turn leads to local phase transitions that may ultimately increase the overlap. The model allows us to quantify how the overlap can be increased by either increasing the heterogeneity of the network (spurious correlation) or the strength of the inter-layer coupling (true correlation), thereby disentangling the two effects. As an application, we show that the empirical overlap in the International Trade Multiplex is not merely a spurious result of the correlation between node degrees across different layers, but requires a non-zero inter-layer coupling in its modeling.

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。

↑