Construction of equilibrium networks with an energy function

Details Construction of equilibrium networks with an energy function Construction of equilibrium networks with an energy function

2007-07-04

arxiv.org/abs/0707.0531v1

Physics

Condensed Matter

Statistical Mechanics

To appear in J. Phys. A

Scientific paper

10.1088/1751-8113/40/32/001

We construct equilibrium networks by introducing an energy function depending on the degree of each node as well as the product of neighboring degrees. With this topological energy function, networks constitute a canonical ensemble, which follows the Boltzmann distribution for given temperature. It is observed that the system undergoes a topological phase transition from a random network to a star or a fully-connected network as the temperature is lowered. Both mean-field analysis and numerical simulations reveal strong first-order phase transitions at temperatures which decrease logarithmically with the system size. Quantitative discrepancies of the simulation results from the mean-field prediction are discussed in view of the strong first-order nature.

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