Cavity approach for real variables on diluted graphs and application to synchronization in small-world lattices.
We study XY spin systems on small-world lattices for a variety of graph structures, e.g., Poisson and scale-free, superimposed upon a one-dimensional chain. In order to solve this model we extend the cavity method in the one pure-state approximation to deal with real-valued dynamical variables. We find that small-world architectures significantly enlarge the region in parameter space where synchronization occurs. We contrast the results of population dynamics performed on a truncated set of cavity fields with Monte Carlo simulations and find fair agreement. Further, we investigate the appearance of replica symmetry breaking in the spin-glass phase by numerically analyzing the proliferation of pure states in the message passing equations.
Skantzos
Nikos S
NS
Instituut voor Theoretische Fysica, Celestijnenlaan 200D, Katholieke Universiteit Leuven, B-3001, Belgium. Nikos.Skantzos@fys.kuleuven.be
Castillo
Isaac Pérez
IP
Hatchett
Jonathan P L
JP