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Zbl 1242.28009
Constantin, Sarah; Strichartz, Robert S.; Wheeler, Miles
Analysis of the Laplacian and spectral operators on the Vicsek set.
(English)
[J] Commun. Pure Appl. Anal. 10, No. 1, 1-44 (2011). ISSN 1534-0392; ISSN 1553-5258/e

Summary: We study the spectral decomposition of the Laplacian on a family of fractals $\cal {VS}_n$ that includes the Vicsek set for $n=2$, extending earlier research on the Sierpinski Gasket. We implement an algorithm [{\it D. Zhou}, Pac. J. Math. 241, No. 2, 369--398 (2009; Zbl 1177.28029)] 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 $\cal {VS}_n$. Finally, we explain how the spectrum of the Laplacian on $\cal {VS}_n$ converges as $n \to \infty$ to the spectrum of the Laplacian on two crossed lines (the limit of the sets $\cal {VS}_n$.)
MSC 2000:
*28A80 Fractals

Keywords: Laplacians on fractals; heat kernels; wave propagators; Green's function; Weyl ratio; eigenvalue clusters; eigenvalue ratio gaps

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