Uniform spectral convergence for operators on abstract quasicrystal graphs

Let G(V,E)G(V,E) be a connected infinite graph with bounded vertex degrees. Assume that GG is amenable and is an abstract quasicrystal graph: for every radius rr and every rr-pattern α\alpha in the finite set Pr(G)P_r(G) of rooted-ball isomorphism classes, there is a frequency P(α)P(\alpha) such that, for every Følner sequence {Qn}n=1\{Q_n\}_{n=1}^{\infty}, the proportion of vertices in QnQ_n having pattern α\alpha converges to P(α)P(\alpha). Uniform spectral convergence conjecture. For random Schrödinger operators, percolation Laplacians, and self-adjoint pattern-invariant operators associated to GG, uniform spectral convergence exists. The claim concerns a common spectral-convergence phenomenon for several operator classes on graphs with uniform local-pattern frequencies; the source does not specify the precise meaning of uniform spectral convergence or provide evidence resolving the conjecture.

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Primary source

Gabor Elek, “Aperiodic order, integrated density of states and the continuous algebras of John von Neumann”, arXiv:math-ph/0606061 (2006).

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