Controlling self-organized criticality in sandpile models

TL;DR

This paper proposes an external control method for sandpile models that reduces large avalanches by triggering near-critical sites, aiming to minimize large events while maintaining local energy dissipation.

Contribution

It introduces a novel control strategy for sandpile models that effectively reduces large avalanches, addressing a gap in existing literature.

Findings

Control reduces large avalanche probability

Control triggers avalanches near critical sites

Preliminary results suggest applicability to undirected models

Abstract

We introduce an external control to reduce the size of avalanches in some sandpile models exhibiting self organized criticality. This rather intuitive approach seems to be missing in the vast literature on such systems. The control action, which amounts to triggering avalanches in sites that are near to be come critical, reduces the probability of very large events, so that energy dissipation occurs most locally. The control is applied to a directed Abelian sandpile model driven by both uncorrelated and correlated deposition. The latter is essential to design an efficient and simple control heuristic, but has only small influence in the uncontrolled avalanche probability distribution. The proposed control seeks a tradeoff between control cost and large event risk. Preliminary results hint that the proposed control works also for an undirected sandpile model.