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Speaker: Professor Peter Clarkson (University of Kent) Date: 7th Aug 2024 - 15:00 to 16:00 Venue: External Title: Matrix Models, Orthogonal Polynomials and Symmetric Freud weights Event: (PDW) Emergent phenomena in nonlinear dispersive waves Abstract: Orthogonal polynomials associated with symmetric Freud weights which arise in the context of Hermitian matrix models and random symmetric matrix ensembles, in particular the sextic Freud weight \[ w(x)=\exp\left\{-N \!\left(g_6x^6+ g_4x^4+g_2x^2 \right)\right\},\eqno(1)\] with $N$, $g_6$, $g_4$ and $g_2$ parameters. In the 1990s the behaviour of the recurrence coefficients in the three-term recurrence relation associated with these orthogonal polynomials for the weight (1) was described as being ``chaotic" and more recently the ``chaotic phase" has been interpreted as a dispersive shock. In this talk I will discuss properties of the recurrence coefficients in the three-term recurrence relation associated with these orthogonal polynomials associated with the sextic Freud weight (1). In particular For this weight, the recurrence coefficients satisfy a fourth-order discrete equation which is the second member of the first discrete Painlev\'e hierarchy, and also known as the ``string equation". 👉 Want to learn more about the talks in this stream? 🔗| Seminar Link: https://www.newton.ac.uk/seminar/43997/ 🔗| Programme Link: https://www.newton.ac.uk/event/pdw/ ------------------- FOLLOW US 🌐| Website: https://www.newton.ac.uk 🎥| Main Channel: / @isaacnewtoninstitute 🐦| Twitter: / newtoninstitute 💬| Facebook: / newton.institute 📷| Instagram: / isaacnewtoninstitute 🔗| LinkedIn: / isaac-newton-institute-for-mathematical-sc... SEMINAR ROOMS 🥇| INI Seminar Room 1: / @iniseminarroom1 🥈| INI Seminar Room 2: / @iniseminarroom2 🛰️| INI Satellite Events: / @inisatellite ABOUT The Isaac Newton Institute is a national and international visitor research institute. It runs research programmes on selected themes in mathematics and the mathematical sciences with applications over a wide range of science and technology. It attracts leading mathematical scientists from the UK and overseas to interact in research over an extended period. 👉 Learn more about us and our events here: https://www.newton.ac.uk