PMID: 22587042May 17, 2012Paper

Flooding transition in the topography of toppling surfaces of stochastic and rotational sandpile models

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
J A Ahmed, S B Santra

Abstract

A continuous phase transition occurs in the topography of toppling surfaces of stochastic and rotational sandpile models when they are flooded with liquid, say water. The toppling surfaces are extracted from the sandpile avalanches that appear due to sudden burst of toppling activity in the steady state of these sandpile models. Though a wide distribution of critical flooding heights exists, a critical point is defined by merging the flooding thresholds of all the toppling surfaces. The criticality of the transition is characterized by power-law distribution of island area in the critical regime. A finite size scaling theory is developed and verified by calculating several new critical exponents. The flooding transition is found to be an interesting phase transition and does not belong to the percolation universality class. The universality class of this transition is found to depend on the degree of self-affinity of the toppling surfaces characterized by the Hurst exponent H and the fractal dimension D(f) of critical spanning islands. The toppling surfaces of different stochastic sandpile models are found to have a single Hurst exponent, whereas those of different rotational sandpile models have another Hurst exponent. As a co...Continue Reading

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Citations

Jan 24, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Himangsu BhaumikS B Santra

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