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First- and second-order phase transitions in Ising models on small-world networks: simulations and comparison with an
A L Ferreira1, J F F Mendes, M Ostilli
1Departamento de Física and I3N, Universidade de Aveiro, 3810-193 Aveiro, Portugal.
Abstract:
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 d0 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 d0=2 is not thermodynamically stable under graph noise.
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