Navegando por Autor "Fernandes, Henrique Almeida"

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    An alternative order parameter for the 4-state Potts model.
    (2006) Fernandes, Henrique Almeida; Arashiro, Everaldo; Felício, José Roberto Drugowich de; Caparica, Álvaro de Almeida
    We have investigated the dynamic critical behavior of the two-dimensional 4-state Potts model using an alternative order parameter first used by Vanderzande [J. Phys. A 20 (1987) L549] in the study of the Z(5) model. We have estimated the global persistence exponent θg by following the time evolution of the probability P(t) that the considered order parameter does not change its sign up to time t. We have also obtained the critical exponents θ, z, ν, and β using this alternative definition of the order parameter and our results are in complete agreement with available values found in literature.
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    A comparative study of the dynamic critical behavior of the four-state Potts like models.
    (2009) Arashiro, Everaldo; Fernandes, Henrique Almeida; Felício, José Roberto Drugowich de
    We investigate the short-time critical dynamics of the Baxter–Wu (BW) and n=3 Turban (3TU) models to estimate their global persistence exponent θg. We conclude that this new dynamical exponent can be useful in detecting differences between the critical behavior of these models which are very difficult to obtain in usual simulations. In addition, we estimate again the dynamical exponents of the four-state Potts (FSP) model in order to compare them with results previously obtained for the BW and 3TU models and to decide between two sets of estimates presented in the current literature. We also revisit the short-time dynamics of the 3TU model in order to check if, as already found for the FSP model, the anomalous dimension of the initial magnetization x0 could be equal to zero.