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Damage-spreading dynamic scaling for the ising model on the sierpinski gasket fractal
1Departamento de Fisica, Centro Federal de Educacao Tecnologica de Alagoas, 57000-000 Maceio, AL, Brazil and Departamento de Fisica Universidade Federal do Rio Grande do Norte, 59072-970 Natal, RN, Brazil.
Abstract:
We study the relaxation towards equilibrium of the ferromagnetic Ising model on the Sierpinski gasket, which is a fractal lattice. We do this by performing Monte Carlo simulations, based on the heat-bath dynamics, and investigating the time evolution of the Hamming distance between two different configurations of the model. Starting with an initial damage created in all lattice sites, we calculate the average values of two quantities that characterize the relaxation process: the nonlinear damage relaxation time (tau), and the time for all sites to be undamaged at least once (tau(c)). We find that tau diverges, at low temperatures, with a dynamical exponent z which depends linearly on the inverse of temperature, as predicted by a generalized scaling theory developed by Henley. There is a complete breakdown of scaling for tau(c).
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