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We construct a one-parameter family of Laplacians on the Sierpiński gasket that are symmetric and self-similar for the 9-map iterated function system obtained by iterating the standard 3-map iterated function system. Our main result is the fact that all these Laplacians satisfy a version of spectral decimation that builds a precise catalog of eigenvalues and eigenfunctions for any choice of the parameter. We give a number of applications of this spectral decimation. We also prove analogous results for fractal Laplacians on the unit interval, and this yields an analogue of the classical Sturm–Liouville theory for the eigenfunctions of these one-dimensional Laplacians.
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Sizhen Fang, Dylan A. King, Eun Bi Lee, Robert S. Strichartz, Spectral decimation for families of self-similar symmetric Laplacians on the Sierpiński gasket. J. Fractal Geom. 7 (2020), no. 1, pp. 1–62DOI 10.4171/JFG/83