Degree-sensitive averaged exponential-sum conjecture

Let JN1J\subset\mathbb{N}_{\geq1} be finite and non-empty. For each iJi\in J, let rir_i be positive, let fijOK[x1,,xn]f_{ij}\in\mathcal{O}_K[x_1,\dots,x_n] be non-constant with deg(fij)=i\operatorname{deg}(f_{ij})=i, and set

r=iJri,I=iJ,1jri(fij).r=\sum_{i\in J}r_i,\qquad \mathcal{I}=\sum_{i\in J,1\leq j\leq r_i}(f_{ij}).

Assume IK(1)\mathcal{I}_K\neq(1), and let ZAOKnZ\subset\mathbb{A}^n_{\mathcal{O}_K} be a subscheme. Define σ0((fij))\sigma_0((f_{ij})) as in the preceding degree-sensitive setup. Degree-sensitive averaged exponential-sum conjecture. There exist a positive constant cc and an integer MM such that, for all LL~K,ML\in\widetilde{\mathcal{L}}_{K,M} and all m2m\geq2,

EL,Z,I(r)(m)cmn+r1qLmσ0((fij)).\left|E_{L,Z,\mathcal{I}}^{(r)}(m)\right|\leq c m^{n+r-1}q_L^{-m\sigma_0((f_{ij}))}.

This conjecture strengthens the preceding averaged estimate by replacing the motivic oscillation index with the explicit degree-sensitive threshold. The source studies it, but does not state that it is proved in this generality.

Sources & referencesView supporting material

Primary source

Kien Huu Nguyen, “Exponential sums and motivic oscillation index of arbitrary ideals and their applications”, arXiv:2305.19732 (2025).

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