Jean V. Bellissard

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For a large class of tilings of R d , including the Penrose tiling in two dimension as well as the icosahedral ones in 3 dimension, the continuous hull Ω T of such a tiling T inherits a minimal R d-lamination structure with flat leaves and a transversal Γ T which is a Cantor set. In this case, we show that the continuous hull can be seen as the projective(More)
An analogue of the Riemannian Geometry for an ultrametric Cantor set (C, d) is described using the tools of Noncommutative Geometry. Associated with (C, d) is a weighted rooted tree, its Michon tree [28]. This tree allows to define a family of spectral triples (C Lip (C), H, D) using the ℓ 2-space of its vertices, giving the Cantor set the structure of a(More)
We give a new proof of correlation estimates for arbitrary moments of the resol-vent of random Schrödinger operators on the lattice that generalizes and extends the correlation estimate of Minami for the second moment. We apply this moment bound to obtain a new n-level Wegner-type estimate that measures eigenvalue correlations through an upper bound on the(More)
For a dense G, of pairs (,I, a) in R', we prove that the operator (Hu)(n) = u(n + 1) + u(n-1) + I cos(2nan + 0) u(n) has a nowhere dense spectrum. Along the way we prove several interesting results about the case a =p/q of which we mention: (a) If qB is not an integral multiple of A, then all gaps are open, and (b) If q is even and 0 is chosen suitably,(More)
Let T be an aperiodic and repetitive tiling of R d with finite local complexity. We present a spectral sequence that converges to the K-theory of T with page-2 iso-morphic to the Pimsner cohomology of T. It is a generalization of the Serre spectral sequence to a class of spaces which are not fibered. The Pimsner cohomology of T generalizes the cohomology of(More)
Let T be an aperiodic and repetitive tiling of R d with finite local complexity. Let Ω be its tiling space with canonical transversal Ξ. The tiling equivalence relation R Ξ is the set of pairs of tilings in Ξ which are translates of each others, with a certain (´ etale) topology. In this paper R Ξ is reconstructed as a generalized " tail equivalence " on a(More)
We study the higher-order correlation functions of covariant families of observ-ables associated with random Schrödinger operators on the lattice in the strong disorder regime. We prove that if the distribution of the random variables has a density analytic in a strip about the real axis, then these correlation functions are analytic functions of the energy(More)