Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1999-06-08
Physica A: Statistical Mechanics and Applications 271, 125-132 (1999).
Physics
Condensed Matter
Disordered Systems and Neural Networks
11 pages, 4 figures, to published in Physica A 1999
Scientific paper
The role of the distribution of coupling constants on the critical exponents of the short-range Ising spin-glass model is investigated via real space renormalization group. A saddle-point spin glass critical point characterized by a fixed-point distribution is found in an appropriated parameter space. The critical exponents $\beta $ and $\nu $ are directly estimated from the data of the local Edwards-Anderson order parameters for the model defined on a diamond hierarchical lattice of fractal dimension $d_{f}=3$. Four distinct initial distributions of coupling constants (Gaussian, bimodal, uniform and exponential) are considered; the results clearly indicate a universal behavior.
Edvaldo Nogueira Jr.
Coutinho Sérgio
Curado Evaldo M. F.
Nobre Fernando D.
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