Higher-dimensional moment asymptotics for volumes of Kostlan zero sets

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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 p⩾3p\geqslant 3 and ϕ1,…,ϕp∈C0(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(r−n2)σn,rp∑I∈P ⁣Pp∏{i,j}∈I(∫Mϕiϕj∣d⁡ ⁣VM∣)+o(dp2(r−n2)).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 ϕ∈C0(M)\phi\in\mathcal{C}^0(M),

mp(⟨νd,ϕ⟩)=μpdp2(r−n2)σn,rp(∫Mϕ2∣d⁡ ⁣VM∣)p2+o(dp2(r−n2)).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.

References

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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