Convergence error estimates at low regularity for time discretizations of KdV

Abstract

We consider various filtered time discretizations of the periodic Korteweg--de Vries equation: a filtered exponential integrator, a filtered Lie splitting scheme as well as a filtered resonance based discretisation and establish convergence error estimates at low regularity. Our analysis is based on discrete Bourgain spaces and allows to prove convergence in $L^2$ for rough data $u_0\in H^s,$ $s>0$ with an explicit convergence rate.