Socio-economical dynamics as a solvable spin system on co-evolving networks

Details Socio-economical dynamics as a solvable spin system on co-evolving networks Socio-economical dynamics as a solvable spin system on co-evolving networks

2007-07-20

arxiv.org/abs/0707.3085v3

Physics

Condensed Matter

Statistical Mechanics

5 pages 3 figs

Scientific paper

We consider social systems in which agents are not only characterized by their states but also have the freedom to choose their interaction partners to maximize their utility. We map such systems onto an Ising model in which spins are dynamically coupled by links in a dynamical network. In this model there are two dynamical quantities which arrange towards a minimum energy state in the canonical framework: the spins, s_i, and the adjacency matrix elements, c_{ij}. The model is exactly solvable because microcanonical partition functions reduce to products of binomial factors as a direct consequence of the c_{ij} minimizing energy. We solve the system for finite sizes and for the two possible thermodynamic limits and discuss the phase diagrams.

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