Extremal beta-polytope intrinsic-volume limit law conjecture

Let U1,,UNU_1,\ldots,U_N be independent random vectors in Rd\mathbb{R}^d with beta density

pd,β(x)=cd,β(1x2)β1Bd(x),p_{d,\beta}(x)=c_{d,\beta}(1-\\|x\\|^2)^\beta\mathbf{1}_{\mathbb B^d}(x),

where β>1\beta>-1, Bd=xRd:x1\mathbb B^d=\\{x\in\mathbb{R}^d:\\|x\\|\leq 1\\}, and vmv_m denotes the mm-th intrinsic volume. Extremal beta-polytope conjecture. For any fixed d,nNd,n\in\mathbb N, β>1\beta>-1, and m0,1,,dm\in\\{0,1,\ldots,d\\}, there exist positive numbers A=A(d,m,n,β)A=A(d,m,n,\beta), B=B(d,m,n,β)B=B(d,m,n,\beta), and C=C(d,m,n,β)C=C(d,m,n,\beta) such that, for every tt,

limNP[NA(maxx1,,xnBdvm([x1,,xn])max1i1<<inNvm([Ui1,,Uin]))t]=1eBtC.\lim_{N\to\infty}\mathbb{P}\left[N^A\left(\max_{x_1,\ldots,x_n\in\mathbb B^d}v_m([x_1,\ldots,x_n])-\max_{1\leq i_1<\cdots<i_n\leq N}v_m([U_{i_1},\ldots,U_{i_n}])\right)\leq t\right]=1-e^{-Bt^C}.

This conjectures a Weibull-type limit law, with suitable positive scaling and distribution parameters, for the deficit between the optimal intrinsic volume among all nn-vertex polytopes in the unit ball and the largest intrinsic volume among the random beta polytopes generated by NN sampled points.

Sources & referencesView supporting material

Primary source

Ekaterina Simarova, “Extremal random beta polytopes”, arXiv:2108.10951 (2021).

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