Analysis of the Laplacian and spectral operators on the Vicsek set

Sarah Constantin; Robert S. Strichartz; Miles Wheeler

doi:10.3934/cpaa.2011.10.1

Article Contents

2011, Volume 10, Issue 1: 1-44. Doi: 10.3934/cpaa.2011.10.1

This issue Previous Article Next Article The existence of weak solutions for a generalized Camassa-Holm equation

Analysis of the Laplacian and spectral operators on the Vicsek set

1.
Department of Mathematics, Princeton University, Fine Hall, Washington Road, Princeton NJ 08544-1000
2.
Mathematics Department, Malott Hall, Cornell Univeristy, Ithaca, NY 14853
3.
Department of Mathematics, Brown University, Box 1917, Providence, RI 02912

Received: January 2010

Revised: April 2010

Published: January 2011

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Abstract

We study the spectral decomposition of the Laplacian on a family of fractals $\mathcal{VS}_n$ that includes the Vicsek set for $n=2$, extending earlier research on the Sierpinski Gasket. We implement an algorithm [23] for spectral decimation of eigenfunctions of the Laplacian, and explicitly compute these eigenfunctions and some of their properties. We give an algorithm for computing inner products of eigenfunctions. We explicitly compute solutions to the heat equation and wave equation for Neumann boundary conditions. We study gaps in the ratios of eigenvalues and eigenvalue clusters. We give an explicit formula for the Green's function on $\mathcal{VS}_n$. Finally, we explain how the spectrum of the Laplacian on $\mathcal{VS}_n$ converges as $n \to \infty$ to the spectrum of the Laplacian on two crossed lines (the limit of the sets $\mathcal{VS}_n$.)

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Mathematics Subject Classification: 28A80.

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