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Bak-sneppen model near zero dimension
Dorogovtsev1, Mendes, Pogorelov
1Departamento de Fisica and Centro de Fisica do Porto, Faculdade de Cieinsertion markncias, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal and A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia.
Abstract:
We consider the Bak-Sneppen model near zero dimension, where the avalanche exponent tau is close to 1 and the exponents &mgr; and sigma are close to 0. We demonstrate that tau-1=&mgr;-sigma=exp-&mgr;(-1)-gamma+ small middle dot small middle dot small middle dot in this limit, where gamma is Euler's constant. The avalanche hierarchy equation is rewritten in a form that makes it possible to find the relation between the critical exponents sigma and &mgr; with high accuracy. We obtain precise values of the critical exponents for the one and two-dimensional Bak-Sneppen model and for the one-dimensional anisotropic Bak-Sneppen model.
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