The phase transition in random catalytic sets

Details The phase transition in random catalytic sets The phase transition in random catalytic sets

2005-04-29

arxiv.org/abs/cond-mat/0504776v1

Physics

Condensed Matter

Other Condensed Matter

7 pages, ugly eps files due to arxiv restrictions

Scientific paper

The notion of (auto) catalytic networks has become a cornerstone in understanding the possibility of a sudden dramatic increase of diversity in biological evolution as well as in the evolution of social and economical systems. Here we study catalytic random networks with respect to the final outcome diversity of products. We show that an analytical treatment of this longstanding problem is possible by mapping the problem onto a set of non-linear recurrence equations. The solution of these equations show a crucial dependence of the final number of products on the initial number of products and the density of catalytic production rules. For a fixed density of rules we can demonstrate the existence of a phase transition from a practically unpopulated regime to a fully populated and diverse one. The order parameter is the number of final products. We are able to further understand the origin of this phase transition as a crossover from one set of solutions from a quadratic equation to the other.

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