期刊
PHYSICAL REVIEW LETTERS
卷 111, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.068701
关键词
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资金
- Spanish MICINN [FIS2010-21781-C02-02, FIS2010-21781-C02-01]
- Generalitat de Catalunya [2009SGR838]
- ICREA Academia prize
- ICREA Academia
We develop an analytical approach to the susceptible-infected-susceptible epidemic model that allows us to unravel the true origin of the absence of an epidemic threshold in heterogeneous networks. We find that a delicate balance between the number of high degree nodes in the network and the topological distance between them dictates the existence or absence of such a threshold. In particular, small-world random networks with a degree distribution decaying slower than an exponential have a vanishing epidemic threshold in the thermodynamic limit.
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