## Well-posedness and scattering results for the generalized Korteweg-de Vries equation via the contraction principle.(English)Zbl 0808.35128

The well-posedness, which includes existence, uniqueness, and continuous dependence upon initial data, is studied for the initial-value problem for the generalized Korteweg-de Vries (KdV) equations of the form $u_ t+ u_{xxx}+ u^ k u_ x=0, \tag{1}$ where $$k$$ is a positive integer. It is well known that equation (1) is exactly integrable for $$k=1$$ (the classical KdV equation) and for $$k=2$$ (the modified KdV equation). At any value of $$k$$, equation (1) has two fundamental integrals of motion, the “momentum” $$\int_{-\infty}^{+\infty} u^ 2(x)dx,$$ and the energy (Hamiltonian). These two integrals of motion are essentially used in the well-posedness analysis. The analysis is based on global estimates for an explicit solution of the linear initial-value problem associate to equation (1), $$v_ t+ v_{xxx}=0$$ combined with the contraction mapping principle. Introducing special functional norms, the authors demonstrate that, for each particular value of $$k$$, there is a relevant class of the Sobolev space to which the initial data $$u_ 0(x)\equiv u(x,t=0)$$ must belong in order to allow for the well-posedness proof, the existence being proved for finite times. The technique of the proof and the particular results obtained are essentially different for the cases $$k<4$$, $$k=4$$, and $$k>4$$, which reflects the fundamental property of equation (1): while at $$k<4$$ the solution developing from generic initial data remains smooth indefinitely long, the weak and strong collapse sets in at a finite time, respectively, at $$k=4$$ and at $$k>4$$.

### MSC:

 35Q53 KdV equations (Korteweg-de Vries equations) 35P25 Scattering theory for PDEs 35A05 General existence and uniqueness theorems (PDE) (MSC2000) 35B45 A priori estimates in context of PDEs

### Keywords:

well-posedness of KdV equations; collapse; Sobolev spaces
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