Laplacian growth & sandpiles on the Sierpinski gasket: limit shape universality and exact solutions

TL;DR

This paper analyzes sandpile and rotor-router growth on the Sierpinski gasket, providing exact solutions, shape theorems, and demonstrating limit shape universality with self-similar patterns and power-law scaling.

Contribution

It offers the first exact recursive construction of sandpile growth on the Sierpinski gasket and establishes limit shape universality among Laplacian growth models on fractals.

Findings

Exact recursive construction of sandpile tiles on $SG$

Demonstration of limit shape universality on fractals

Identification of periodic radial jumps and power-law scaling

Abstract

We establish quantitative spherical shape theorems for rotor-router aggregation and abelian sandpile growth on the graphical Sierpinski gasket ($SG$) when particles are launched from the corner vertex. In particular, the abelian sandpile growth problem is exactly solved via a recursive construction of self-similar sandpile tiles. We show that sandpile growth and patterns exhibit a $(2\cdot 3^n)$-periodicity as a function of the initial mass. Moreover, the cluster explodes---increments by more than 1 in radius---at periodic intervals, a phenomenon not seen on $\mathbb{Z}^d$ or trees. We explicitly characterize all the radial jumps, and use the renewal theorem to prove the scaling limit of the cluster radius, which satisfies a power law modulated by log-periodic oscillations. In the course of our proofs we also establish structural identities of the sandpile groups of subgraphs of $SG$ with two different boundary conditions, notably the corresponding identity elements conjectured by Fairchild, Haim, Setra, Strichartz, and Westura. Our main theorems, in conjunction with recent results of Chen, Huss, Sava-Huss, and Teplyaev, establish $SG$ as a positive example of a state space which exhibits "limit shape universality," in the sense of Levine and Peres, among the four Laplacian growth models: divisible sandpiles, abelian sandpiles, rotor-router aggregation, and internal diffusion-limited aggregation (IDLA). We conclude the paper with conjectures about radial fluctuations in IDLA on $SG$, possible extensions of limit shape universality to other state spaces, and related open problems.