# Random inscribed polytopes have similar radius functions as Poisson-Delaunay mosaics

Edelsbrunner H, Nikitenko A. 2018. Random inscribed polytopes have similar radius functions as Poisson-Delaunay mosaics. Annals of Applied Probability. 28(5), 3215–3238.

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Abstract

Using the geodesic distance on the n-dimensional sphere, we study the expected radius function of the Delaunay mosaic of a random set of points. Specifically, we consider the partition of the mosaic into intervals of the radius function and determine the expected number of intervals whose radii are less than or equal to a given threshold. We find that the expectations are essentially the same as for the Poisson–Delaunay mosaic in n-dimensional Euclidean space. Assuming the points are not contained in a hemisphere, the Delaunay mosaic is isomorphic to the boundary complex of the convex hull in Rn+1, so we also get the expected number of faces of a random inscribed polytope. As proved in Antonelli et al. [Adv. in Appl. Probab. 9–12 (1977–1980)], an orthant section of the n-sphere is isometric to the standard n-simplex equipped with the Fisher information metric. It follows that the latter space has similar stochastic properties as the n-dimensional Euclidean space. Our results are therefore relevant in information geometry and in population genetics.

Publishing Year

Date Published

2018-10-01

Journal Title

Annals of Applied Probability

Volume

28

Issue

5

Page

3215 - 3238

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### Cite this

Edelsbrunner H, Nikitenko A. Random inscribed polytopes have similar radius functions as Poisson-Delaunay mosaics.

*Annals of Applied Probability*. 2018;28(5):3215-3238. doi:10.1214/18-AAP1389Edelsbrunner, H., & Nikitenko, A. (2018). Random inscribed polytopes have similar radius functions as Poisson-Delaunay mosaics.

*Annals of Applied Probability*. Institute of Mathematical Statistics. https://doi.org/10.1214/18-AAP1389Edelsbrunner, Herbert, and Anton Nikitenko. “Random Inscribed Polytopes Have Similar Radius Functions as Poisson-Delaunay Mosaics.”

*Annals of Applied Probability*. Institute of Mathematical Statistics, 2018. https://doi.org/10.1214/18-AAP1389.H. Edelsbrunner and A. Nikitenko, “Random inscribed polytopes have similar radius functions as Poisson-Delaunay mosaics,”

*Annals of Applied Probability*, vol. 28, no. 5. Institute of Mathematical Statistics, pp. 3215–3238, 2018.Edelsbrunner, Herbert, and Anton Nikitenko. “Random Inscribed Polytopes Have Similar Radius Functions as Poisson-Delaunay Mosaics.”

*Annals of Applied Probability*, vol. 28, no. 5, Institute of Mathematical Statistics, 2018, pp. 3215–38, doi:10.1214/18-AAP1389.**All files available under the following license(s):**

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arXiv 1705.02870