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arXiv 1602.08593math.COmath.MG
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多面体的傅里叶变换、立体角和和离散体积

Fourier transforms of polytopes, solid angle sums, and discrete volume

Ricardo Diaz, Quang-Nhat Le, Sinai Robins

摘要:

给定一个实封闭的多胞形$P$,首先利用Stokes定理的迭代方法描述其指示函数的傅里叶变换.然后,我们使用随后的傅里叶变换公式,连同泊松求和公式,给出一个新的算法来计算分数加权格点内的所有真正的$P$的膨胀的单参数家庭。$P$的面偏序集的组合学在描述$P$的傅里叶变换中起着核心作用。我们还获得了一个封闭的形式的余维-1系数,出现在一个扩展的这个总和的权力的真正的膨胀参数$t$。这种封闭形式推广了关于Macdonald立体角多项式的一些已知结果,Macdonald立体角多项式是传统上通过要求$t$仅假设整数值而获得的类似表达式。虽然大多数目前的方法适用于所有真正的多面体,一个特别好的应用程序是研究所有真正的扩张的整数(和理性)多面体。

英文摘要:

Given a real closed polytope $P$, we first describe the Fourier transform of its indicator function by using iterations of Stokes' theorem. We then use the ensuing Fourier transform formulations, together with the Poisson summation formula, to give a new algorithm to count fractionally-weighted lattice points inside the one-parameter family of all real dilates of $P$. The combinatorics of the face poset of $P$ plays a central role in the description of the Fourier transform of $P$. We also obtain a closed form for the codimension-1 coefficient that appears in an expansion of this sum in powers of the real dilation parameter $t$. This closed form generalizes some known results about the Macdonald solid-angle polynomial, which is the analogous expression traditionally obtained by requiring that $t$ assumes only integer values. Although most of the present methodology applies to all real polytopes, a particularly nice application is to the study of all real dilates of integer (and rational) polytopes.

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