Self-organized criticality as a phase transition

Details Self-organized criticality as a phase transition Self-organized criticality as a phase transition

2003-07-28

arxiv.org/abs/cond-mat/0307688v1

Physics

Condensed Matter

Statistical Mechanics

Review chapter to appear in Advances in Condensed Matter and Statistical Mechanics, ed. by E. Korutcheva and R. Cuerno, Nova S

Scientific paper

The original sandpile model of Bak, Tang and Wiesenfeld from 1987 has inspired lots of consequent work and further ideas of how to describe the birth of scale-invariant statistics in various systems and in particular models. In this article the basic ingredients of self-organized criticality (SOC) are overviewed. In line with the orginal arguments of BTW SOC is now known to be a property of systems where dissipation and external drive maintain a delicate balance. The qualitative and quantitive understanding of the SOC state and deviations from it can thus be addressed, by mapping the typical cellular automata exhibiting SOC to theories, that in fact describe critical extended systems as such. Currently two such approaches are known, based on the connections of SOC to variants of absorbing state phase transitions and the physics of elastic manifolds or interfaces in random media. These are reviewed and discussed. Finally, some open theoretical problems and experimental suggestions are outlined.

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