Almost sure global well posedness for the BBM equation with infinite $L^2$ initial data

Abstract

We consider the probabilistic Cauchy problem for the Benjamin-Bona-Mahony equation (BBM) on the one-dimensional torus $\mathbb{T}$ with initial data below $L^2(\mathbb{T})$. With respect to random initial data of strictly negative Sobolev regularity, we prove that BBM is almost surely globally well-posed. The argument employs the $I$-method to obtain an a priori bound on the growth of the `residual' part of the solution. We then discuss the stability properties of the solution map in the deterministically ill-posed regime.

54 pages; modified Proposition 2.5, minor modifications throughout and typos corrected. To appear in Discrete Contin. Dyn. Syst. A