Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2010-01-08
Phys. Rev. E 82, 011141 (2010)
Physics
Condensed Matter
Disordered Systems and Neural Networks
12 pages, 12 figures, 1 table
Scientific paper
10.1103/PhysRevE.82.011141
We perform simulations of random Ising models defined over small-world networks and we check the validity and the level of approximation of a recently proposed effective field theory. Simulations confirm a rich scenario with the presence of multicritical points with first- or second-order phase transitions. In particular, for second-order phase transitions, independent of the dimension d_0 of the underlying lattice, the exact predictions of the theory in the paramagnetic regions, such as the location of critical surfaces and correlation functions, are verified. Quite interestingly, we verify that the Edwards-Anderson model with d_0=2 is not thermodynamically stable under graph noise.
Ferreira Antonio Luis
Mendes Jose Fernando F.
Ostilli Massimo
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