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Couplings for determinantal point processes and their reduced Palm distributions with a view to quantifying repulsiveness

by Jesper Møller and Eliza O'Reilly
CSGB Research Reports Number 7 (June 2018)

For a determinantal point process X with a kernel K whose spectrum is strictly less than one, André Goldman has established a coupling to its reduced Palm process Xu at a point u with K(u,u)>0 so that in distribution Xu is obtained by removing a finite number of points from X. The intensity function of the difference XXu is known, but apart from special cases the distribution of XXu is unknown. Considering the restriction XS of X to any compact set S, we establish a coupling of XS and its reduced Palm process XuS so that the difference is at most one point. Specifically, we assume K restricted to S×S is either (i) a projection or (ii) has spectrum strictly less than one. In case of (i), we have in distribution that XuS is obtained by removing one point from XS, and we can specify the distribution of this point. In case of (ii), in distribution we obtain XuS either by moving one point in X or by removing one point from XS, and to a certain extent we can describe the distribution of these points. We discuss how Goldman's and our results can be used for quantifying repulsiveness in X.

Keywords: Ginibre point process, globally most repulsive determinantal point process, isotropic determinantal point process on the sphere, globally most repulsive determinantal point process, projection kernel, stationary determinantal point process in Euclidean space.

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