Abstract
The purpose of this paper is to show the relationship in all dimensions between the structural (diffraction pattern) aspect of tilings (described by Čech cohomology of the tiling space) and the spectral properties (of Hamiltonians defined on such tilings) defined by K-theory, and to show their equivalence in dimensions ≤ 3. A theorem makes precise the conditions for this relationship to hold. It can be viewed as an extension of the “Bloch Theorem”to a large class of aperiodic tilings. The idea underlying this result is based on the relationship between cohomology and K-theory traces and their equivalence in low dimensions.
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