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Bulletin of the American Mathematical Society

ISSN 1088-9485(online) ISSN 0273-0979(print)

   
 
 

 

Laplacian growth, sandpiles, and scaling limits


Authors: Lionel Levine and Yuval Peres
Journal: Bull. Amer. Math. Soc. 54 (2017), 355-382
MSC (2010): Primary 31C20, 35R35, 60G50, 60K35, 82C24
DOI: https://doi.org/10.1090/bull/1573
Published electronically: April 13, 2017
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Abstract: Laplacian growth is the study of interfaces that move in proportion to harmonic measure. Physically, it arises in fluid flow and electrical problems involving a moving boundary. We survey progress over the last decade on discrete models of (internal) Laplacian growth, including the abelian sandpile, internal DLA, rotor aggregation, and the scaling limits of these models on the lattice $ \epsilon {\mathbb{Z}}^d$ as the mesh size $ \epsilon $ goes to zero. These models provide a window into the tools of discrete potential theory, including harmonic functions, martingales, obstacle problems, quadrature domains, Green functions, smoothing. We also present one new result: rotor aggregation in $ {\mathbb{Z}}^d$ has $ O(\log r)$ fluctuations around a Euclidean ball, improving a previous power-law bound. We highlight several open questions, including whether these fluctuations are $ O(1)$.


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Additional Information

Lionel Levine
Affiliation: Department of Mathematics, Cornell University, Ithaca, New York 14853

Yuval Peres
Affiliation: Microsoft Research, Redmond, Washington 98052

DOI: https://doi.org/10.1090/bull/1573
Keywords: Abelian sandpile, chip-firing, discrete Laplacian, divisible sandpile, Eulerian walkers, internal diffusion limited aggregation, looping constant, obstacle problem, rotor-router model, scaling limit, unicycle, Tutte slope
Received by editor(s): September 23, 2016
Published electronically: April 13, 2017
Additional Notes: The first author was supported by NSF grant \href{http://www.nsf.gov/awardsearch/showAward?AWD_{I}D=1455272}DMS-1455272 and a Sloan Fellowship.
Article copyright: © Copyright 2017 by Lionel Levine and Yuval Peres