The smooth Alpert trilinear Fourier extension conjecture for the paraboloid

Let 0<δ<10<\delta<1 and κN\kappa\in\mathbb{N} with κ>20δ\kappa>\frac{20}{\delta}. For 1<q<1<q<\infty, 0<ε,ν<10<\varepsilon,\nu<1, let Edisjνδ,κ(3LLq3;ε)\mathcal{E}_{\operatorname{disj}\nu}^{\delta,\kappa}(\otimes_3L^{\infty}\rightarrow L^{\frac{q}{3}};\varepsilon) denote the single-scale disjoint trilinear inequality defined using smooth Alpert pseudoprojections and ν\nu-disjoint triples of squares. Smooth (δ,κ)(\delta,\kappa)-Alpert trilinear Fourier extension conjecture. For every q>3q>3 there is ν>0\nu>0 depending on qq such that Edisjνδ,κ(3LLq3;ε)\mathcal{E}_{\operatorname{disj}\nu}^{\delta,\kappa}(\otimes_3L^{\infty}\rightarrow L^{\frac{q}{3}};\varepsilon) holds. This conjecture is equivalent, by the theorem stated in the source, to the linear Fourier extension conjecture for the paraboloid in R3\mathbb{R}^3; its resolution is not supplied here.

Sources & referencesView supporting material

Primary source

Eric T. Sawyer, “A comparison of trilinear testing conditions for the paraboloid Fourier extension and Kakeya conjectures in three dimensions”, arXiv:2411.18457 (2026).

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