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We obtain a sharp bilinear restriction estimate for the paraboloid in $\mathbb{R}^3$ for $q>3.25$.

Classical Analysis and ODEs · Mathematics 2025-01-23 Changkeun Oh

For cylindrically symmetric functions dyadically supported on the paraboloid, we obtain a family of sharp linear and bilinear adjoint restriction estimates. As corollaries, we first extend the ranges of exponents for the classical…

Classical Analysis and ODEs · Mathematics 2008-06-01 Shuanglin Shao

Bennett, Carbery and Tao considered the $k$-linear restriction estimate in $\mathbb{R}^{n+1}$ and established the near optimal $L^\frac2{k-1}$ estimate under transversality assumptions only. We have shown that the trilinear restriction…

Classical Analysis and ODEs · Mathematics 2018-10-31 Ioan Bejenaru

Bennett, Carbery and Tao established nearly optimal $L^1$ trilinear restriction estimates in $\mathbb{R}^{n+1}$ under transversality assumptions only. In this paper we show that the curvature improves the range of exponents, by establishing…

Classical Analysis and ODEs · Mathematics 2016-03-10 Ioan Bejenaru

We prove a refined trilinear Kakeya estimate in three dimensions, valid for small values of the transversality parameter.

Classical Analysis and ODEs · Mathematics 2025-06-24 Javier Ramos

Recently Wolff obtained a sharp $L^2$ bilinear restriction theorem for bounded subsets of the cone in general dimension. Here we adapt the argument of Wolff to also handle subsets of ``elliptic surfaces'' such as paraboloids and spheres.…

Classical Analysis and ODEs · Mathematics 2007-05-23 Terence Tao

This result sharpens the bilinear to linear deduction of Lee and Vargas for extension estimates on the hyperbolic paraboloid in $\mathbb R^3$ to the sharp line, leading to the first scale-invariant restriction estimates, beyond the…

Classical Analysis and ODEs · Mathematics 2018-12-19 Betsy Stovall

We prove that a local trilinear extension inequality on the paraboloid in three dimensions is equivalent to the Fourier restriction conjecture, and then we prove a variant involving smooth Alpert wavelets that represents the weakest such…

Classical Analysis and ODEs · Mathematics 2026-03-19 Cristian Rios , Eric Sawyer

We prove a class of modified paraboloid restriction estimates with a loss of angular derivatives for the full set of paraboloid restriction conjecture indices. This result generalizes the paraboloid restriction estimate in radial case from…

Analysis of PDEs · Mathematics 2019-06-12 Changxing Miao , Junyong Zhang , Jiqiang Zheng

We improve the range of exponents for the restriction problem for the 3-d paraboloid over finite fields. The key new ingredient is a variant of the Bourgain-Katz-Tao finite field incidence theorem derived from sum-product estimates. In…

Classical Analysis and ODEs · Mathematics 2016-06-01 Mark Lewko

It is known that under some transversality and curvature assumptions on the hypersurfaces involved, the bilinear restriction estimate holds true with better exponents than what would trivially follow from the corresponding linear estimates.…

Classical Analysis and ODEs · Mathematics 2016-03-09 Ioan Bejenaru

The Fourier restriction conjecture is a fundamental problem in harmonic analysis. In this paper, we investigate restriction estimates for degenerate higher codimensional quadratic surfaces and obtain sharp results for some types of…

Classical Analysis and ODEs · Mathematics 2026-03-06 Zhenbin Cao , Changxing Miao , Yixuan Pang

We provide $L^p \to L^q$ refinements on some Fourier restriction estimates obtained using polynomial partitioning. Let $S\subset \mathbb{R}^3$ be a compact $C^\infty$ surface with strictly positive second fundamental form. We derive sharp…

Classical Analysis and ODEs · Mathematics 2017-02-10 Jongchon Kim

In connection with the restriction problem in $\mathbb R^n$ for hypersurfaces including the sphere and paraboloid, the bilinear (adjoint) restriction estimates have been extensively studied. However, not much is known about such estimates…

Classical Analysis and ODEs · Mathematics 2017-10-23 Jong-Guk Bak , Jungjin Lee , Sanghyuk Lee

In this paper we establish the optimal multilinear restriction estimate for n-1 hypersurfaces with some curvature, where $n$ is the dimension of the underlying space. The result is sharp up to the endpoint and the role of curvature is made…

Classical Analysis and ODEs · Mathematics 2020-03-02 Ioan Bejenaru

We obtain sharp estimates for certain trilinear oscillatory integrals. In particular, we extend Phong and Stein's seminal result to a trilinear setting. This result partially answers a question raised by Christ, Li, Tao and Thiele…

Classical Analysis and ODEs · Mathematics 2016-02-19 Lechao Xiao

We provide an alternative and self contained proof of the main result of Bennett, Carbery, Tao regarding the multilinear restriction estimate. The approach is inspired by the recent result of Guth about the Kakeya version of multilinear…

Classical Analysis and ODEs · Mathematics 2016-01-14 Ioan Bejenaru

We propose a new approach to the Fourier restriction conjectures. It is based on a discretization of the Fourier extension operators in terms of quadratically modulated wave packets. Using this new point of view, and by combining natural…

Classical Analysis and ODEs · Mathematics 2024-10-16 Camil Muscalu , Itamar Oliveira

We show that the Fourier extension conjecture on the paraboloid in three dimensions is equivalent to a local single scale smooth Alpert trilinear inequality, which is an improvement of an analogous multiscale trilinear inequality in…

Classical Analysis and ODEs · Mathematics 2026-03-31 Cristian Rios , Eric T. Sawyer

We apply geometric incidence estimates in positive characteristic to prove the optimal $L^2 \to L^3$ Fourier extension estimate for the paraboloid in the four-dimensional vector space over a prime residue field. In three dimensions, when…

Combinatorics · Mathematics 2018-10-08 Misha Rudnev , Ilya D. Shkredov
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