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arXiv 2402.02809math.FA
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Shubin类中符号的傅里叶积分算子的Wigner分析

Wigner Analysis of Fourier Integral Operators with symbols in the Shubin classes

Elena Cordero, Gianluca Giacchi, Luigi Rodino, Mario Valenzano

AI总结:

本文研究傅里叶积分算子Wigner核的衰减,证明Shubin类符号优于Hörmander类,能克服非线性正则变换带来的障碍,实现随阶数降低而改善的核局部化。

摘要:

我们研究了I型和II型傅里叶积分算子的Wigner核的衰减性质。允许这些核具有良好衰减的符号空间是负阶$m$的Shubin类$\Gamma^m(\mathbb{R^{2d}})$。所考虑的相位是所谓的驯服相位,它们出现在薛定谔传播子中。相关的正则变换允许是非线性的。正是这些变换的非线性,当符号取自Hörmander类$S^{0}_{0,0}(\mathbb{R^{2d}})$时,是良好核局部化的主要障碍。在这里,我们证明Shubin类克服了这个问题,并允许良好的核局部化,且随着阶数$m$的减小而改善。

英文摘要:

We study the decay properties of Wigner kernels for Fourier integral operators of types I and II. The symbol spaces that allow a nice decay of these kernels are the Shubin classes $Γ^m(\mathbb{R^{2d}})$, with negative order $m$. The phases considered are the so-called tame ones, which appear in the Schrödinger propagators. The related canonical transformations are allowed to be nonlinear. It is the nonlinearity of these transformations that are the main obstacles for nice kernel localizations when symbols are taken in the Hörmander's class $S^{0}_{0,0}(\mathbb{R^{2d}})$. Here we prove that Shubin classes overcome this problem and allow a nice kernel localization, which improves with the decreasing of the order $m$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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