Analysis of orthogonality and of orbits in affine iterated function systems

By Dorin Ervin Dutkay, Palle E. T. Jorgensen. 2006

184 citations recorded by the source corpus.

We introduce a duality for affine iterated function systems (AIFS) which is naturally motivated by group duality in the context of traditional harmonic analysis. Our affine systems yield fractals defined by iteration of contractive affine mappings. We build a duality for such systems by scaling in two directions: fractals in the small by contractive iterations, and fractals in the large by recursion involving iteration of an expansive matrix. By a fractal in the small we mean a compact attractor X supporting Hutchinson’s canonical measure μ, and we ask when μ is a spectral measure, i.e., when the Hilbert space $${L^2( \mu)}$$ has an orthonormal basis (ONB) of exponentials $$\{{e_\lambda, | \lambda \in \Lambda}\}$$ . We further introduce a Fourier duality using a matched pair of such affine systems. Using next certain extreme cycles, and positive powers of the expansive matrix we build fractals in the large which are modeled on lacunary Fourier series and which serve as spectra for X. Our two main results offer simple geometric conditions allowing us to decide when the fractal in the large is a spectrum for X. Our results in turn are illustrated with concrete Sierpinski like fractals in dimensions 2 and 3.

Subfields: Applied Mathematics, Mathematical Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/6de7c42250331196052e6b06899c4150f3e8141a

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In Applied Mathematics

In Mathematical Physics

In Statistical and Nonlinear Physics

Citations in the corpus

Non-spectral problem for a class of planar self-affine measures (2008, background): “3 and Example 3.1], by applying [4, Theorem 3.1], Dutkay and Jorgensen [4] obtained that μM,D-orthogonal exponentials contain at most 7 elements.”
ON THE SPECTRA OF A CANTOR MEASURE (2008, background): “Detailed analysis on this was given and many new examples were constructed in a recent paper [4].”