Higher-dimensional moment asymptotics for volumes of Kostlan zero sets

From papers

Let MM be a real algebraic manifold of dimension nn, let sds_d be a random section in the complex Fubini--Study model in dimension nn and codimension r{1,,n}r\in\{1,\dots,n\}, and let νd\nu_d denote the volume measure of the real zero set of sds_d. For p3p\geqslant 3 and ϕ1,,ϕpC0(M)\phi_1,\dots,\phi_p\in\mathcal{C}^0(M), define mp(νd)(ϕ1,,ϕp)m_p(\nu_d)(\phi_1,\dots,\phi_p) as the pp-th joint moment functional. Higher-dimensional moment conjecture. As d+d\to +\infty,

mp(νd)(ϕ1,,ϕp)=dp2(rn2)σn,rpIP ⁣Pp{i,j}I(Mϕiϕjd ⁣VM)+o(dp2(rn2)).m_p(\nu_d)(\phi_1,\dots,\phi_p)=d^{\frac{p}{2}(r-\frac{n}{2})}\sigma_{n,r}^p\sum_{\mathcal{I}\in\mathcal{P\!P}_p}\prod_{\{i,j\}\in\mathcal{I}}\left(\int_M\phi_i\phi_j\left\lvert\operatorname{d}\!V_M\right\rvert\right)+o\left(d^{\frac{p}{2}(r-\frac{n}{2})}\right).

In particular, for ϕC0(M)\phi\in\mathcal{C}^0(M),

mp(νd,ϕ)=μpdp2(rn2)σn,rp(Mϕ2d ⁣VM)p2+o(dp2(rn2)).m_p(\langle\nu_d,\phi\rangle)=\mu_p d^{\frac{p}{2}(r-\frac{n}{2})}\sigma_{n,r}^p\left(\int_M\phi^2\left\lvert\operatorname{d}\!V_M\right\rvert\right)^{\frac{p}{2}}+o\left(d^{\frac{p}{2}(r-\frac{n}{2})}\right).

Here P ⁣Pp\mathcal{P\!P}_p denotes the set of pair partitions of {1,,p}\{1,\dots,p\}, and μp\mu_p is the corresponding number of pairings when pp is even, with the usual vanishing interpretation for odd pp.

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Primary source

Michele Ancona and Thomas Letendre, “Roots of Kostlan polynomials: moments, strong Law of Large Numbers and Central Limit Theorem”, arXiv:1911.12182 (2021).

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