Local asymptotic distribution of zeros of orthogonal polynomials

Totik, Vilmos; Ullman, Joseph L.

doi:10.1090/S0002-9947-1994-1150019-2

Local asymptotic distribution of zeros of orthogonal polynomials
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by Vilmos Totik and Joseph L. Ullman

Trans. Amer. Math. Soc. 341 (1994), 881-894

DOI: https://doi.org/10.1090/S0002-9947-1994-1150019-2

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Abstract:

Converse results, which state a relation (inequality) for measures from that on their logarithmic potentials, are applied to local density of zeros of orthogonal polynomials when the measure of orthogonality is a general one with compact support. It will be shown that if the measure is sufficiently thick on a part of its support, then on that part the density of the zeros will be at least as large as the equilibrium measure of the support. A corresponding upper estimate on the distribution of the zeros will also be proved. All of our estimates are sharp, and they localize several well-known results.

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