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arXiv 2007.04117math.PR
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平坦极限中的行列式点过程:广义L-系综、部分投影DPP和普适类

Determinantal Point Processes in the Flat Limit: Extended L-ensembles, Partial-Projection DPPs and Universality Classes

Simon Barthelmé, Nicolas Tremblay, Konstantin Usevich, Pierre-Olivier Amblard

摘要:

行列式点过程(DPPs)是排斥点过程,其中点之间的相互作用取决于半正定矩阵的行列式。本文的贡献是双重的。首先,我们引入了扩展L系综的概念,这是一种新的DPPs表示。这些扩展的L-系综是有趣的对象,因为它们修复了DPP的通常形式中的一些病态,例如投影DPP不是L-系综的事实。每个(固定大小)DPP是一个(固定大小)扩展L-系综,包括投影DPP。这种新的形式主义,使介绍和分析的DPP的一个子类,称为部分投影DPP。其次,有了这些新的定义,我们首先表明,部分投影DPP出现的扰动限制的L-系综,也就是说,限制在$\varepsilon \rightarrow 0$的L-系综的基础上矩阵的形式$\varepsilon \mathbf{A} + \mathbf{B}$其中$\mathbf{B}$是低秩。我们概括了这一结果表明,部分投影DPPs也出现的限制过程的L-系综的基础上的内核矩阵,当核函数变得平坦(使每个点相互作用,在某种意义上)。我们证明了极限点过程主要依赖于核函数的光滑性。在某些情况下,限制过程甚至是通用的,这意味着它不依赖于核函数的细节,而只依赖于其平滑度。

英文摘要:

Determinantal point processes (DPPs) are repulsive point processes where the interaction between points depends on the determinant of a positive-semi definite matrix. The contributions of this paper are two-fold. First of all, we introduce the concept of extended L-ensemble, a novel representation of DPPs. These extended L-ensembles are interesting objects because they fix some pathologies in the usual formalism of DPPs, for instance the fact that projection DPPs are not L-ensembles. Every (fixed-size) DPP is an (fixed-size) extended L-ensemble, including projection DPPs. This new formalism enables to introduce and analyze a subclass of DPPs, called partial-projection DPPs. Secondly, with these new definitions in hand, we first show that partial-projection DPPs arise as perturbative limits of L-ensembles, that is, limits in $\varepsilon \rightarrow 0$ of L-ensembles based on matrices of the form $\varepsilon \mathbf{A} + \mathbf{B}$ where $\mathbf{B}$ is low-rank. We generalise this result by showing that partial-projection DPPs also arise as the limiting process of L-ensembles based on kernel matrices, when the kernel function becomes flat (so that every point interacts with every other point, in a sense). We show that the limiting point process depends mostly on the smoothness of the kernel function. In some cases, the limiting process is even universal, meaning that it does not depend on specifics of the kernel function, but only on its degree of smoothness.

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