论文标题

通过分层散射检测障碍物的内在全球几何形状

Detecting intrinsic global geometry of an obstacle via layered scattering

论文作者

Bunimovich, Leonid, Katz, Gabriel

论文摘要

Given a closed $k$-dimensional submanifold $K$, incapsulated in a compact domain $M \subset \mathbb E^n$, $k \leq n-2$, we consider the problem of determining the intrinsic geometry of the obstacle $K$ (like volume, integral curvature) from the scattering data, produced by the reflections of geodesic trajectories from the boundary of a tubular $ε$ -Neighborhood $ \ Mathsf t(k,ε)$ k $ in $ m $。参与这种散射的大地测量学是从边界$ \ partial m $散发出来的,并在从边界$ \ partial \ partial \ mathsf t(k,ε)$的一些反射后终止了那里。但是,在这种情况下的主要问题是,通过输入一些陷阱,可能会陷入$ k $附近的射线,以使该射线将对$ \ partial \ partial \ sathsf t(k,ε)$产生无限的反射。为了排除这种可能性,我们通过从球形气泡构建它来修改管$ \ mathsf t(k,ε)$的几何形状。我们需要使用$ \ lceil \ dim(k)/2 \ rceil $许多冒泡的管$ \ {\ Mathsf t(k,ε_j)_ j $来检测某些反映其内在的微分的$ k $的全局不变性。因此,标题中的“分层散射”一词。赫尔曼·韦伊尔(Hermann Weyl)在他的管道理论$ \ mathsf t(k,ε)$及其卷中研究了这些不变的人。

Given a closed $k$-dimensional submanifold $K$, incapsulated in a compact domain $M \subset \mathbb E^n$, $k \leq n-2$, we consider the problem of determining the intrinsic geometry of the obstacle $K$ (like volume, integral curvature) from the scattering data, produced by the reflections of geodesic trajectories from the boundary of a tubular $ε$-neighborhood $\mathsf T(K, ε)$ of $K$ in $M$. The geodesics that participate in this scattering emanate from the boundary $\partial M$ and terminate there after a few reflections from the boundary $\partial \mathsf T(K, ε)$. However, the major problem in this setting is that a ray (a billiard trajectory) may get stuck in the vicinity of $K$ by entering some trap there so that this ray will have infinitely many reflections from $\partial \mathsf T(K, ε)$. To rule out such a possibility, we modify the geometry of a tube $\mathsf T(K, ε)$ by building it from spherical bubbles. We need to use $\lceil \dim(K)/2\rceil$ many bubbling tubes $\{\mathsf T(K, ε_j)\}_j$ for detecting certain global invariants of $K$, invariants which reflect its intrinsic geometry. Thus the words "layered scattering" in the title. These invariants were studied by Hermann Weyl in his classical theory of tubes $\mathsf T(K, ε)$ and their volumes.

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