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For a certain domain $\Omega$ in the Sierpinski gasket $\mathcal{SG}$ whose boundary is a line segment, a complete description of the eigenvalues of the Laplacian, with an exact count of dimensions of eigenspaces, under the Dirichlet and…

Functional Analysis · Mathematics 2013-06-11 Hua Qiu

We construct a one-parameter family of Laplacians on the Sierpinski 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…

Spectral Theory · Mathematics 2020-03-31 Sizhen Fang , Dylan A. King , Eun Bi Lee , Robert S. Strichartz

We present a new method to approximate the Neumann spectrum of a Laplacian on a fractal K in the plane as a renormalized limit of the Neumann spectra of the standard Laplacian on a sequence of domains that approximate K from the outside.…

Analysis of PDEs · Mathematics 2009-10-11 Tyrus Berry , Steven M. Heilman , Robert S. Strichartz

A fractafold, a space that is locally modeled on a specified fractal, is the fractal equivalent of a manifold. For compact fractafolds based on the Sierpinski gasket, it was shown by the first author how to compute the discrete spectrum of…

Functional Analysis · Mathematics 2018-06-29 Robert Strichartz , Alexander Teplyaev

We use spectral decimation to provide formulae for computing the harmonic gradients of Laplacian eigenfunctions on the Sierpinski Gasket. These formulae are given in terms of special functions that are defined as infinite products.

Classical Analysis and ODEs · Mathematics 2007-11-15 Jessica L. DeGrado , Luke G. Rogers , Robert S. Strichartz

This article develops analysis on fractal $3N$-gaskets, a class of post-critically finite fractals which include the Sierpinski triangle for $N=1$, specifically properties of the Laplacian $\Delta$ on these gaskets. We first prove the…

Mathematical Physics · Physics 2018-06-29 Daniel Kelleher , Nikhar Gupta , Maxwell Margenot , Jason Marsh , William Oakley , Alexander Teplyaev

In this paper, we establish an analogue of the classical mean value property for both the harmonic functions and some general functions in the domain of the Laplacian on the Sierpinski gasket. Furthermore, we extend the result to some other…

Classical Analysis and ODEs · Mathematics 2013-05-17 Hua Qiu , Robert S. Strichartz

In this survey article, we investigate the spectral properties of fractal differential operators on self-similar fractals. In particular, we discuss the decimation method, which introduces a renormalization map whose dynamics describes the…

Mathematical Physics · Physics 2014-03-25 Nishu Lal , Michel L. Lapidus

In this paper, we explore some significant properties associated with a fractal operator on the space of all continuous functions defined on the Sierpi\'nski Gasket (SG). We also provide some results related to constrained approximation…

Functional Analysis · Mathematics 2022-06-30 V. Agrawal , S. Verma , T. Som

This paper studies the size of the minimal gap between any two consecutive eigenvalues in the Dirichlet and in the Neumann spectrum of the standard Laplace operator on the Sierpinski gasket. The main result shows the remarkable fact that…

Spectral Theory · Mathematics 2021-05-04 Patricia Alonso Ruiz

In this paper, we first characterize the finiteness of fractal interpolation functions (FIFs) on post critical finite self-similar sets. Then we study the Laplacian of FIFs with uniform vertical scaling factors on Sierpinski gasket (SG). As…

Functional Analysis · Mathematics 2016-11-02 Xiao-Hui Li , Huo-Jun Ruan

In the case of some fractals, sampling with average values on cells is more natural than sampling on points. In this paper we investigate this method of sampling on $SG$ and $SG_{3}$. In the former, we show that the cell graph…

Analysis of PDEs · Mathematics 2015-10-07 Robert J. Ravier , Robert S. Strichartz

The method of spectral decimation is applied to an infinite collection of self--similar fractals. The sets considered belong to the class of nested fractals, and are thus very symmetric. An explicit construction is given to obtain formulas…

Analysis of PDEs · Mathematics 2018-08-27 Sergio A. Hernandez , Federico Menendez-Conde

We prove versions of the strong Sz\"ego limit theorem for certain classes of pseudodifferential operators defined on the Sierpi\'nski gasket. Our results used in a fundamental way the existence of localized eigenfunctions for the Laplacian…

Spectral Theory · Mathematics 2014-06-20 Marius Ionescu , Kasso A. Okoudjou , Luke G. Rogers

We present a new approach to the theory of k-forms on self-similar fractals. We work out the details for two examples, the standard Sierpinski gasket and the 3-dimensional Sierpinski gasket, but the method is expected to be effective for…

Classical Analysis and ODEs · Mathematics 2012-06-07 Skye Aaron , Zach Conn , Robert Strichartz , Hui Yu

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 [24] for spectral…

Analysis of PDEs · Mathematics 2016-04-06 Sarah Constantin , Robert S. Strichartz , Miles Wheeler

In this article we study the energy level spectrum of fractals which have block-hierarchical structures. We develop a method to study the spectral properties in terms of linearization of spectral decimation procedure and verify it…

Disordered Systems and Neural Networks · Physics 2020-09-02 Askar A. Iliasov , Mikhail I. Katsnelson , Shengjun Yuan

Consider $\mathbb{R}^3$ equipped with the Euclidean metric and the Gaussian measure. Let $\Sigma$ be a complete embedded self-shrinker in $\mathbb{R}^3$ with the induced metric and weighted measure, and let $\lambda_1$ denote the first…

Differential Geometry · Mathematics 2025-10-01 Elham Matinpour

In view of promising applications of fractal nanostructures, we analyze the spectra of quantum particles in the Sierpinski carpet and study the non-correlated electron gas in this geometry. We show that the spectrum exhibits scale…

Mesoscale and Nanoscale Physics · Physics 2015-03-27 Alberto Hernando , Miroslav Sulc , Jiri Vanicek

We use the existence of localized eigenfunctions of the Laplacian on the Sierpinski gasket to formulate and prove analogues of the strong Szego limit theorem in this fractal setting. Furthermore, we recast some of our results in terms of…

Spectral Theory · Mathematics 2008-10-15 Kasso A. Okoudjou , Luke G. Rogers , Robert S. Strichartz
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