Uniform spectral convergence for operators on abstract quasicrystal graphs

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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.

References

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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