Well-posedness and persistence properties for two-component higher order Camassa-Holm systems with fractional inertia operator

TL;DR

This paper investigates the well-posedness and persistence of solutions for a two-component higher order Camassa-Holm system with fractional inertia, establishing local existence in various Besov spaces and examining the behavior of compactly supported solutions.

Contribution

It provides new results on local well-posedness in nonhomogeneous and critical Besov spaces, and analyzes the propagation and persistence properties of solutions with fractional inertia operators.

Findings

Established local well-posedness in Besov spaces for the system.

Analyzed the propagation of compactly supported solutions.

Proved persistence properties in weighted L^p spaces for solutions with fractional inertia.

Abstract

In this paper, we study the Cauchy problem for a two-component higher order Camassa-Holm systems with fractional inertia operator $A=(1-\partial_x^2)^r,r\geq1$, which was proposed by Escher and Lyons. By the transport equation theory and Littlewood-Paley decomposition, we obtain that the local well-posedness of solutions for the system in nonhomogeneous Besov spaces $B^s_{p,q}\times B^{s-2r+1}_{p,q}$ with $1\leq p,q \leq +\infty$ and the Besov index $s>\max\left\{2r +\frac{1}{p},2r+1-\frac{1}{p}\right\}$. Moreover, we construct the local well-posedness in the critical Besov space $B^{2r+\frac{1}{2}}_{2,1}\times B^{\frac{3}{2}}_{2,1}$. On the other hand, the propagation behaviour of compactly supported solutions is examined, namely whether solutions which are initially compactly supported will retain this property throughout their time of evolution. Moreover, we also establish the persistence properties of the solutions to the two-component Camassa-Holm equation with $r=1$ in weighted $L_{\phi}^p:=L^p(\mathbb{R},\phi^p(x)dx)$ spaces for a large class of moderate weights.