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<p>In this work we show how to get advantage from the Riemann–Hilbert analysis in order to obtain first and second order differential equations for the orthogonal polynomials and associated functions with a weight on the unit circle. We&#xa0;deduce properties for the recurrence relation coefficients from differential properties of the weight. We take the so called generalized modified Jacobi and Bessel weights as a case&#xa0;study.</p>

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Generalized semiclassical orthogonal polynomials on the unit circle: A Riemann–Hilbert perspective

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月7日

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  • Amílcar Branquinho,
  • Ana Foulquié-Moreno,
  • Karina Rampazzi

摘要

In this work we show how to get advantage from the Riemann–Hilbert analysis in order to obtain first and second order differential equations for the orthogonal polynomials and associated functions with a weight on the unit circle. We deduce properties for the recurrence relation coefficients from differential properties of the weight. We take the so called generalized modified Jacobi and Bessel weights as a case study.