Extremal beta-polytope intrinsic-volume limit law conjecture

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

pd,β(x)=cd,β(1−∣x∣2)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=x∈Rd:∣x∣≤1\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,n∈Nd,n\in\mathbb N, β>−1\beta>-1, and m∈0,1,…,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,

lim⁡N→∞P[NA(max⁡x1,…,xn∈Bdvm([x1,…,xn])−max⁡1≤i1<⋯<in≤Nvm([Ui1,…,Uin]))≤t]=1−e−BtC.\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.

References

Primary source

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

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