敲敲打打听鼓声

Xing Wang, Emmett L. Wyman, Yakun Xi
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引用次数: 0

摘要

我们研究了卡氏问题的一个变体:"如果我们允许自己获取一些额外的信息,人们能听到鼓的形状吗?特别是,我们允许自己 "听到 "流形上每一点的局部韦尔计数函数,并询问这是否足以唯一地恢复黎曼度量。这在物理上等同于问,如果允许在鼓上的任何地方敲击,能否确定鼓的形状。我们证明,只要鼓的拉普拉斯-贝尔特拉姆谱是简单的,这个问题的答案就是 "是"。我们还提供了一个反例,说明为什么这个假设是必要的。
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Hearing the shape of a drum by knocking around
We study a variation of Kac's question, "Can one hear the shape of a drum?" if we allow ourselves access to some additional information. In particular, we allow ourselves to ``hear" the local Weyl counting function at each point on the manifold and ask if this is enough to uniquely recover the Riemannian metric. This is physically equivalent to asking whether one can determine the shape of a drum if one is allowed to knock at any place on the drum. We show that the answer to this question is ``yes" provided the Laplace-Beltrami spectrum of the drum is simple. We also provide a counterexample illustrating why this hypothesis is necessary.
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