Ill-posedness of the Camassa-Holm and related equations in the critical space

Abstract

We prove norm inflation and hence ill-posedness for a class of shallow water wave equations, such as the Camassa-Holm equation, Degasperis-Procesi equation and Novikov equation etc., in the critical Sobolev space $H^{3/2}$ and even in the Besov space $B_{p,r}^{1+1/p}$ for $p\in [1,\infty ],r\in (1,\infty ]$. Our results cover both real-line and torus cases (only real-line case for Novikov), solving an open problem left in the previous works (\cite{Danchin2,Byers,HHK}).

to appear JDE

References in corpus (2)

• An integrable shallow water equation with peaked solitons
• Strong illposedness of the incompressible Euler equation in integer $C^m$ spaces

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