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arXiv · 2610.12681

The square function estimate for the cone in four dimensions

Faruk Temur
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Abstract

We obtain the $L^3$ reverse square function estimate for the light cone in four dimensions from the critical local-smoothing and round-cone propagation statements in the September 2026 OpenAI manuscript. We state these inputs, together with the plate maximal theorem of Di Plinio and Parissis, in a preliminaries section. The proof passes from geometric concentration of packet coefficients to regularity of the analyzed wave, and then from free waves to arbitrary functions supported near the cone. As a consequence, we obtain the corresponding $L^3$ estimate for the sphere and elliptic paraboloids in three dimensions.

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Faruk Temur. 2026-10-08. The square function estimate for the cone in four dimensions. https://arxiv.org/abs/2610.12681

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