Haakan Hedenmalm

KTH Stockholm


Soft Riemann-Hilbert problems and planar orthogonal polynomials


Mathematical Physics Seminar


13th May 2022, 1:45 pm – 3:30 pm
Fry Building, 2.04


It is known that planar orthogonal polynomials with respect to exponentially varying weights can be characterized in terms of a matrix dbar-problem. In recent work with A. Wennman, an asymptotic expansion for the orthogonal polynomials was found. The proof required scaffolding in terms of the construction of an invariant flow. Here, we find a direct approach in terms of a guess for the Cauchy potential in the Riemann-Hilbert problem. This seems to connect with integrable hierarchies but that aspect remains to explore. The solution allows for better control of the error term, and the main underlying equation is solved by finite Neumann series expansion.





Biography:

Talk recording: https://mediasite.bris.ac.uk/Mediasite/Play/ea35d4f95d884036996f78be2e8cfb211d

Organiser: Thomas Bothner

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