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arXiv 1209.0945math.FAmath.AP
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演化算子的Gabor表示

Gabor representations of evolution operators

Elena Cordero, Fabio Nicola, Luigi Rodino

摘要:

我们进行时频分析的傅立叶乘法器,更一般地说,伪微分算子的符号Gevrey,解析和超解析正则性。作为一个应用程序,我们表明,Gabor框架,它提供了最佳的稀疏分解Schroedinger型传播,揭示是一个更有效的工具,代表解决方案的广泛的一类演化算子的常系数,包括弱双曲型和抛物型运营商。除了类的运营商,主要的新颖性的文件是超指数(相对于超多项式)的非对角衰减的Gabor矩阵表示的证明。

英文摘要:

We perform a time-frequency analysis of Fourier multipliers and, more generally, pseudodifferential operators with symbols of Gevrey, analytic and ultra-analytic regularity. As an application we show that Gabor frames, which provide optimally sparse decompositions for Schroedinger-type propagators, reveal to be an even more efficient tool for representing solutions to a wide class of evolution operators with constant coefficients, including weakly hyperbolic and parabolic-type operators. Besides the class of operators, the main novelty of the paper is the proof of super-exponential (as opposite to super-polynomial) off-diagonal decay for the Gabor matrix representation.

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