## A Liouville theorem for the critical generalized Korteweg-de Vries equation.(English)Zbl 0963.37058

This paper deals with the equation $\begin{cases} u_t+(u_{xx}+ u^5)_x= 0,\quad & (t,x)\in\mathbb{R}_+\times\mathbb{R}\\ u(x,0)=u_0(x), \quad x\in\mathbb{R}\end{cases} \tag{1}$ for $$u_0\in H^1(\mathbb{R})$$. The authors present a surprising rigidity result on the flow of (1) close to a soliton up to scaling and translation. For a proof of this result the authors introduce new techniques which will give a result of asymptotic completeness.

### MSC:

 37K10 Completely integrable infinite-dimensional Hamiltonian and Lagrangian systems, integration methods, integrability tests, integrable hierarchies (KdV, KP, Toda, etc.) 35Q53 KdV equations (Korteweg-de Vries equations) 37K40 Soliton theory, asymptotic behavior of solutions of infinite-dimensional Hamiltonian systems
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