Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-03-20
PhysicaA370:163-178,2006
Physics
Condensed Matter
Disordered Systems and Neural Networks
24 pages, 16 figures, style file included
Scientific paper
10.1016/j.physa.2006.03.010
We present the results of Monte Carlo simulations for the critical dynamics of the three-dimensional site-diluted quenched Ising model. Three different dynamics are considered, these correspond to the local update Metropolis scheme as well as to the Swendsen-Wang and Wolff cluster algorithms. The lattice sizes of L=10-96 are analysed by a finite-size-scaling technique. The site dilution concentration p=0.85 was chosen to minimize the correction-to-scaling effects. We calculate numerical values of the dynamical critical exponents for the integrated and exponential autocorrelation times for energy and magnetization. As expected, cluster algorithms are characterized by lower values of dynamical critical exponent than the local one: also in the case of dilution critical slowing down is more pronounced for the Metropolis algorithm. However, the striking feature of our estimates is that they suggest that dilution leads to decrease of the dynamical critical exponent for the cluster algorithms. This phenomenon is quite opposite to the local dynamics, where dilution enhances critical slowing down.
Berche Bertrand
Holovatch Yu.
Ilnytskyi Ja.
Ivaneyko Dmytro
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