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arXiv math-ph/0501008math-phmath.MP
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由热核的迹恢复区域的形状

On Recovering the Shape of a Domain from the Trace of the Heat Kernel

Z. Schuss, A. Spivak

摘要:

从初边值问题的热核迹中恢复区域的几何性质的问题出现在NMR显微镜和其他应用中。它类似于“听到鼓的形状”的问题,对于该问题,泊松型求和公式将域的几何性质与拉普拉斯方程的狄利克雷或诺伊曼问题的特征值联系起来。众所周知,平面区域中的面积、周长和孔洞数可以由热传导方程初边值问题解的短时渐近性来恢复。众所周知,域中封闭台球轨迹的长度谱可以从特征值或波动方程的解中恢复。对于无边界的紧致流形,这个谱也可以从热核中得到。我们证明了对于有边界的平面区域,长度谱可以直接从热核迹的短时展开中恢复出来。结果可以直接推广到更高的维度。

英文摘要:

The problem of recovering geometric properties of a domain from the trace of the heat kernel for an initial-boundary value problem arises in NMR microscopy and other applications. It is similar to the problem of ``hearing the shape of a drum'', for which a Poisson type summation formula relates geometric properties of the domain to the eigenvalues of the Dirichlet or Neumann problem for the Laplace equation. It is well known that the area, circumference, and the number of holes in a planar domain can be recovered from the short time asymptotics of the solution of the initial-boundary value problem for the heat equation. It is also known that the length spectrum of closed billiard ball trajectories in the domain can be recovered from the eigenvalues or from the solution of the wave equation. This spectrum can also be recovered from the heat kernel for a compact manifold without boundary. We show that for a planar domain with boundary, the length spectrum can be recovered directly from the short time expansion of the trace of the heat kernel. The results can be extended to higher dimensions in a straightforward manner.

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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