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arXiv 1507.00883math.AP
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具有一般相位和奇异振幅的振荡积分的渐近估计:在色散方程中的应用

Asymptotic estimates of oscillatory integrals with general phase and singular amplitude: Applications to dispersive equations

Florent Dewez

摘要:

本文给出了关于大参数的振荡积分的vanderCorput型估计,其中相位允许有实阶驻点,振幅允许有可积奇点.由此产生的估计明确显示了这两个特定点对衰变的影响。然后将这些结果应用于一族色散方程的解,其生成元是傅立叶乘子。我们探讨的效果的限制紧凑的频带和奇异频率的初始条件的衰减。给出了时空锥上的一致估计和L-无穷范数估计,并在一定的假设下证明了衰减率的最优性。此外,在无穷大的符号上的色散的增长限制的影响表现出来。

英文摘要:

In this paper, we furnish van der Corput types estimates for oscillatory integrals with respect to a large parameter, where the phase is allowed to have a stationary point of real order and the amplitude to have an integrable singularity. The resulting estimates show explicitly the influence of these two particular points on the decay. These results are then applied to the solutions of a family of dispersive equations whose generators are Fourier multipliers. We explore the effect of a limitation to compact frequency bands and of singular frequencies of the initial condition on the decay. Uniform estimates in space-time cones as well as L-infinity-norm estimates are furnished and the optimality of the decay rates is proved under certain hypotheses. Moreover the influence of a growth limitation at infinity of the symbols on the dispersion is exhibited.

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