Rogue peakon, well-posedness, ill-posedness and blow-up phenomenon for an integrable Camassa-Holm type equation

TL;DR

This paper introduces a new rogue peakon solution for an integrable Camassa-Holm type equation, analyzes its well-posedness and ill-posedness in Besov spaces, and investigates conditions for global existence or finite-time blow-up.

Contribution

It discovers a novel rogue peakon solution, establishes well-posedness and ill-posedness results in specific Besov spaces, and characterizes blow-up phenomena based on initial data sign.

Findings

Existence of rogue peakon solutions with logarithmic form

Well-posedness in certain Besov spaces

Finite-time blow-up under specific initial conditions

Abstract

In this paper, we study an integrable Camassa-Holm (CH) type equation with quadratic nonlinearity. The CH type equation is shown integrable through a Lax pair, and particularly the equation is found to possess a new kind of peaked soliton (peakon) solution - called {\sf rogue peakon}, that is given in a rational form with some logarithmic function, but not a regular traveling wave. We also provide multi-rogue peakon solutions. Furthermore, we discuss the local well-posedness of the solution in the Besov space $B_{p,r}^{s}$ with $1\leq p,r\leq\infty$, $s>\max \left\{1+1/p,3/2\right\}$ or $B_{2,1}^{3/2}$, and then prove the ill-posedness of the solution in $B_{2,\infty}^{3/2}$. Moreover, we establish the global existence and blow-up phenomenon of the solution, which is, if $m_0(x)=u_0-u_{0xx}\geq(\not\equiv) 0$, then the corresponding solution exists globally, meanwhile, if $m_0(x)\leq(\not\equiv) 0$, then the corresponding solution blows up in a finite time.