Computation of large-genus solutions of the Korteweg–de Vries equation

We consider the numerical computation of finite-genus solutions of the Korteweg–de Vries equation when the genus is large. Our method applies both to the initial-value problem when spectral data can be computed and to dressing scenarios when spectral data is specified arbitrarily. In order to compute large genus solutions, we employ a weighted Chebyshev basis to solve an associated singular integral equation. We also extend previous work to compute period matrices and the Abel map when the genus is large, maintaining numerical stability. We demonstrate our method on four different classes of solutions. Specifically, we demonstrate dispersive quantization for “box” initial data and demonstrate how a large genus limit can be taken to produce a new class of potentials. •We compute finite-genus solutions of the KdV equation with then genus is large.•We accurately solve the periodic initial-value problem for the KdV equation.•Chebyshev polynomials are used to solve an RH problem on a large number of cuts.•Nonlinear dispersive quantization is investigated.