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arXiv 1612.09072math.APmath.CA
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色散方程的非齐次振荡积分和整体光滑效应

Inhomogeneous Oscillatory Integrals and Global Smoothing Effects for Dispersive Equations

Tianxiao Huang, Shanlin Huang, Quan Zheng

摘要:

研究了${\mathcal F}^{-1}(e^{ita(\cdot)}ψ(\cdot))$型振荡积分,其中$a$是在原点和无穷远处均满足椭圆型和非退化条件的一般函数,$ψ$属于某个符号类.在空间-时间的逐点估计得到部分清晰度。作为应用,研究了色散方程的$L^p-L^q$和Dahartz型的整体光滑效应.并给出了分数阶薛定谔方程的一个应用。

英文摘要:

We study oscillatory integrals of the type ${\mathcal F}^{-1}(e^{ita(\cdot)}ψ(\cdot))$ where $a$ is a general function satisfying some elliptic type and non-degenerate conditions at both the origin and infinity, and $ψ$ belongs to some symbol class. Point-wise estimates in space-time are gained with partial sharpness. As applications, global smoothing effects of $L^p-L^q$ as well as Strichartz type for dispersive equations are studied. An application to fractional Schrödinger equations is also given.

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