Well-posedness and peakons for a higher-order $\mu$-Camassa-Holm equation

Abstract

In this paper, we study the Cauchy problem of a higher-order $\mu$-Camassa-Holm equation. By employing the Green's function of $(\mu -{\partial }_x^2{)}^{-2}$, we obtain the explicit formula of the inverse function $(\mu -{\partial }_x^2{)}^{-2}w$ and local well-posedness for the equation in Sobolev spaces $H^s(\mathbb{S})$, $s>\frac{7}{2}$. Then we prove the existence of global strong solutions and weak solutions. Moreover, we show that the data-to-solution map is Hölder continuous in $H^s(\mathbb{S})$, $s\ge 4$, equipped with the $H^r(\mathbb{S})$-topology for $0\le r<s$. Finally, the equation is shown to admit single peakon solutions which have continuous second derivatives and jump discontinuities in the third derivatives.

27 pages