The lifespan of small data solutions for Intermediate Long Wave equation (ILW)

Abstract

This article represents a first step toward understanding the long-time dynamics of solutions for the Intermediate Long Wave equation (ILW). While this problem is known to be both completely integrable and globally well-posed in $H^{\frac{3}{2}}$, much less seems to be known concerning its long-time dynamics. Here we prove well-posedness at much lower regularity, namely an $L^2$ global well-posedness result. Then we consider the case of small and localized data and show that the solutions disperse up to cubic timescale.