Video library: W. Van Assche, Zero distribution of orthogonal polynomials on a $q$-lattice

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International Conference on Complex Analysis dedicated to the memory of Andrei Gonchar and Anatoliy Vitushkin October 7, 2019 11:30, Moscow, Steklov Mathematical Institute of RAS, Conference hall, 9th floor

Zero distribution of orthogonal polynomials on a $q$-lattice W. Van Assche
Abstract: We give the asymptotic behavior of the zeros of orthogonal polynomials, after appropriate scaling, for which the orthogonality measure is supported on the $q$-lattice $\{q^k, k=0,1,2,3,\ldots\}$, where $0 < q < 1$. The asymptotic distribution of the zeros is given by the radial part of the equilibrium measure of an extremal problem in logarithmic potential theory for circular symmetric measures with a constraint imposed by the $q$-lattice.