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Limiting shapes for a non-abelian sandpile growth model and related cellular automata

We present limiting shape results for a non-abelian variant of the abelian sandpile growth model (ASGM), some of which have no parallel in the ASGM. One of our limiting shapes is an octagon. In our model, mass spreads from the origin by the toppling rule in Zhang's sandpile model. Previously, several limiting shape results have been obtained for the ASGM using abelianness and monotonicity as main tools. As both properties fail for our model, we use a new proof technique: in our main proof, we introduce several cellular automata to mimic our growth model.

preprint2010arXivOpen access
Anne FeyHaiyan Liu
math.COmath.PR
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Anne FeyHaiyan Liu

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