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arXiv 2101.01008math.AP
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锥点处的半经典传播

Semiclassical propagation through cone points

Peter Hintz

AI总结:

该研究提出高频波锥点衍射的通用框架,证明非对称首项算子下锥点半经典正则性的几乎精确损失及严格衍射测地线的正则性改善,应用于高能预解估计等,采用半经典锥微积分完成证明。

摘要:

我们引入了一个研究高频波在锥点处衍射的通用框架。我们证明,即使底层算子在圆锥奇点处的首项不满足对称性,半经典正则性也会通过锥点传播,且损失几乎精确。此外,我们证明了沿严格衍射测地线的正则性有所改善。应用包括复值或矩阵值平方反比势以及狄拉克-库仑方程的高能预解估计。我们还证明了半经典圆锥拉普拉斯算子的精确传播估计。证明使用了作者最近引入的半经典锥微积分,将径向点估计与精确锥上散射问题的估计相结合。微积分的二次微局部细化捕捉了锥点处的半经典余法正则性,从而促进了对半经典锥正则性和b-正则性的统一处理。

英文摘要:

We introduce a general framework for the study of the diffraction of waves by cone points at high frequencies. We prove that semiclassical regularity propagates through cone points with an almost sharp loss even when the underlying operator has leading order terms at the conic singularity which fail to be symmetric. We moreover show improved regularity along strictly diffractive geodesics. Applications include high energy resolvent estimates for complex- or matrix-valued inverse square potentials and for the Dirac-Coulomb equation. We also prove a sharp propagation estimate for the semiclassical conic Laplacian. The proofs use the semiclassical cone calculus, introduced recently by the author, and combine radial point estimates with estimates for a scattering problem on an exact cone. A second microlocal refinement of the calculus captures semiclassical conormal regularity at the cone point and thus facilitates a unified treatment of semiclassical cone and b-regularity.

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