Fractal spectral triples on Kellendonk's $C^{\ast }$-algebra of a substitution tiling

Abstract

We introduce a new class of noncommutative spectral triples on Kellendonk's $C^{\ast }$-algebra associated with a nonperiodic substitution tiling. These spectral triples are constructed from fractal trees on tilings, which define a geodesic distance between any two tiles in the tiling. Since fractals typically have infinite Euclidean length, the geodesic distance is defined using Perron-Frobenius theory, and is self-similar with scaling factor given by the Perron-Frobenius eigenvalue. We show that each spectral triple is $\theta$-summable, and respects the hierarchy of the substitution system. To elucidate our results, we construct a fractal tree on the Penrose tiling, and explicitly show how it gives rise to a collection of spectral triples.

Updated to agree with published version

References in corpus (4)

• Dynamical Systems on Spectral Metric Spaces
• C*-algebras of tilings with infinite rotational symmetry
• Fractal dual substitution tilings
• K-theory of crossed products of tiling C*-algebras by rotation groups

Cited by in corpus (2)

• Index theory and topological phases of aperiodic lattices
• Classification of tiling $C^{\ast }$-algebras