Europhys. Lett.
Volume 71, Number 6, September 2005
Page(s) 1029 - 1035
Section Interdisciplinary physics and related areas of science and technology
Published online 10 August 2005
Europhys. Lett., 71 (6), pp. 1029-1035 (2005)
DOI: 10.1209/epl/i2005-10167-2

Emergence of weight-topology correlations in complex scale-free networks

G. Bianconi

The Abdus Salam International Center for Theoretical Physics Strada Costiera 11, 34014 Trieste, Italy INFM, UdR Trieste - via Beirut 2-4, 34014, Trieste, Italy

received 31 May 2005; accepted 11 July 2005
published online 10 August 2005

Different weighted scale-free networks show weight-topology correlations. A clear signature of these correlations is given by the non-linear scaling of the node strength with its connectivity. In this paper, we show that networks with and without weight-topology correlations can emerge from the same simple growth dynamics of the nodes connectivities and of the links weights. A weighted fitness network is introduced in which both nodes and links are assigned intrinsic fitness. This model can show a local dependence of the weight-topology correlations and can undergo a phase transition to a state in which the network is dominated by few links which acquire a finite fraction of the total weight of the network.

89.75.Hc - Networks and genealogical trees.
89.75.Fb - Structures and organization in complex systems.
89.75.Da - Systems obeying scaling laws.

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