The general Hadamard convergence conjecture for smooth sections

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Let X/FqX/\mathbb{F}_q be a smooth projective variety equipped with an ample line bundle L\mathcal{L}, and let Ud⊂Γ(X,Ld)U_d \subset \Gamma(X,\mathcal{L}^d) be the open subvariety of smooth sections. The Hadamard convergence conjecture states that, in the Hadamard topology on H1\mathcal{H}_1,

lim⁡d→∞ZUd(q−dim⁡Udt)=(ZXKap([q−(dim⁡X+1)]))−1\lim_{d\rightarrow \infty} Z_{U_d}\left(q^{-\dim U_d}t\right)=\left(Z_X^{\mathrm{Kap}}\left([q^{-(\dim X+1)}]\right)\right)^{-1}

and

(ZXKap([q−(dim⁡X+1)]))−1=(∏k=1∞ZSym⁡kX(q−k(dim⁡X+1)t))−1.\left(Z_X^{\mathrm{Kap}}\left([q^{-(\dim X+1)}]\right)\right)^{-1}=\left(\prod_{k=1}^{\infty}Z_{\operatorname{Sym}^k X}\left(q^{-k(\dim X+1)}t\right)\right)^{-1}.

This conjecture strengthens the preceding convergence results, which hold separately in the Witt and weight topologies, by predicting convergence in their common Hadamard refinement. Its general validity remains open.

References

Primary source

Margaret Bilu and Sean Howe, “Motivic Euler products in motivic statistics”, arXiv:1910.05207 (2019).

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