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arXiv 2302.03575math.AP
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频散方程的精确局部适定性和非线性光滑性

Sharp local well-posedness and nonlinear smoothing for dispersive equations through frequency-restricted estimates

Simão Correia, Filipe Oliveira, Jorge Drumond Silva

摘要:

我们考虑的问题,建立非线性光滑的一般特征的非线性色散方程,即改进的正则性的积分项的Duhamel公式,相对于初始数据和相应的正则性的线性发展,以及如何这种性质涉及到局部适定性。在第一步中,我们展示了如何将问题一般减少到特定频率限制估计的推导,这些估计是仅在空间频率中的乘数估计。然后,利用一种精确的方法,证明了修正的Zakharov-Kuznetsov方程、三次和五次非线性薛定谔方程以及四次Korteweg-de Vries方程的估计.

英文摘要:

We consider the problem of establishing nonlinear smoothing as a general feature of nonlinear dispersive equations, i.e. the improved regularity of the integral term in Duhamel's formula, with respect to the initial data and the corresponding regularity of the linear evolution, and how this property relates to local well-posedness. In a first step, we show how the problem generally reduces to the derivation of specific frequency-restricted estimates, which are multiplier estimates in the spatial frequency alone. Then, using a precise methodology, we prove these estimates for the specific cases of the modified Zakharov-Kuznetsov equation, the cubic and quintic nonlinear Schrödinger equation and the quartic Korteweg-de Vries equation.

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