A new hierarchy of avalanches observed in Bak-Sneppen evolution model

Details A new hierarchy of avalanches observed in Bak-Sneppen evolution model A new hierarchy of avalanches observed in Bak-Sneppen evolution model

1999-05-17

arxiv.org/abs/cond-mat/9905239v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, 4 figures

Scientific paper

A new quantity, average fitness, is introduced in Bak-Sneppen evolution model. Through this new quantity, a new hierarchy of avalanches is observed in the evolution of Bak-Sneppen model. An exact gap equation, governing the self-organization of the model, is presented. It is found that the self-organized threshold of the new quantity can be exactly obtained. Two basic exponents, avalanche distribution and avalanche dimension are given through simulations of one- and two-dimensional Bak-Sneppen models. It is suggested that this new quantity may be a good quantity in determining the emergence of criticality.

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