Instability in a Network Coevolving with a Particle System

Details Instability in a Network Coevolving with a Particle System Instability in a Network Coevolving with a Particle System

2007-12-14

arxiv.org/abs/0712.2374v1

Phys. Rev. Lett. 100, 118702 (2008)

Physics

Condensed Matter

Statistical Mechanics

4 pages and 5 figures

Scientific paper

10.1103/PhysRevLett.100.118702

We study a coupled dynamics of a network and a particle system. Particles of density $\rho$ diffuse freely along edges, each of which is rewired at a rate given by a decreasing function of particle flux. We find that the coupled dynamics leads to an instability toward the formation of hubs and that there is a dynamic phase transition at a threshold particle density $\rho_c$. In the low density phase, the network evolves into a star-shaped one with the maximum degree growing linearly in time. In the high density phase, the network exhibits a fat-tailed degree distribution and an interesting dynamic scaling behavior. We present an analytic theory explaining mechanism for the instability and a scaling theory for the dynamic scaling behavior.

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