Ill-posedness for a generalized Camassa–Holm equation with higher-order nonlinearity in the critical Besov space

Abstract

In this paper, we prove that the Cauchy problem for a generalized Camassa–Holm equation with higher-order nonlinearity is ill-posed in the critical Besov space $$B^1_{\infty ,1}(\mathbb {R})$$ . It is shown in (J. Differ. Equ., 327:127-144,2022) that the Camassa–Holm equation is ill-posed in $$B^1_{\infty ,1}(\mathbb {R})$$ , here we turn our attention to a higher-order nonlinear generalization of Camassa–Holm equation proposed by Hakkaev and Kirchev (Commun Partial Differ Equ 30:761-781,2005). With newly constructed initial data, we get the norm inflation in the critical space $$B^1_{\infty ,1}(\mathbb {R})$$ which leads to ill-posedness.