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arXiv · 1205.0850

Rough solutions of the fifth-order KdV equations

Zihua Guo·Chulkwang Kwak·Soonsik Kwon
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Abstract

We consider the Cauchy problem of the fifth-order equation arising from the Korteweg-de Vries (KdV) hierarchy u_t + u_{xxxxx} + c_1u_{x} u_{xx} + c_2u u_{x} = 0 x,t \in \R We prove a priori bound of solutions for H^s(\R) with s >= 5/4 and the local well-posedness for s >= 2. The method is a short time X^{s,b} space, which is first developed by Ionescu-Kenig-Tataru in the context of the KP-I equation. In addition, we use a weight on localized X^{s,b} structures to reduce the contribution of high-low frequency interaction where the low frequency has large modulation. As an immediate result from a conservation law, we have the fifth-order equation in the KdV hierarchy is globally well-posed in the energy space H^2.

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Zihua Guo, Chulkwang Kwak, Soonsik Kwon. 2012-06-19. Rough solutions of the fifth-order KdV equations. https://arxiv.org/abs/1205.0850

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