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In this survey, we collect recent progress in the understanding of $L^{p}$ bounds for bilinear spherical averages and some associated maximal functions like the bilinear spherical maximal function and its lacunary counterpart. We describe…

Classical Analysis and ODEs · Mathematics 2026-03-03 Tainara Borges

We study bilinear rough singular integral operators $\mathcal{L}_{\Omega}$ associated with a function $\Omega$ on the sphere $\mathbb{S}^{2n-1}$. In the recent work of Grafakos, He, and Slav\'ikov\'a (Math. Ann. 376: 431-455, 2020), they…

Classical Analysis and ODEs · Mathematics 2022-07-14 Danqing He , Bae Jun Park

We prove an $L^p$-spectral multiplier theorem for sub-Laplacians on Heisenberg type groups under the sharp regularity condition $s>d\left|1/p-1/2\right|$, where $d$ is the topological dimension of the underlying group. Our approach relies…

Analysis of PDEs · Mathematics 2025-02-11 Lars Niedorf

In the present paper, we consider the Cauchy problem of the system of quadratic derivative nonlinear Schr\"odinger equations for the spatial dimension $d=2$ and $3$. This system was introduced by M. Colin and T. Colin (2004). The first…

Analysis of PDEs · Mathematics 2024-09-12 Hiroyuki Hirayama , Shinya Kinoshita

We prove $L^p \rightarrow L^q$ Fourier restriction estimates for 3-dimensional quadratic surfaces in $\mathbb{R}^5$. Our results are sharp, up to endpoints, for a few classes of surfaces.

Classical Analysis and ODEs · Mathematics 2022-08-30 Shaoming Guo , Changkeun Oh

The classical Stein-Tomas restriction theorem is equivalent to the statement that the spectral measure $dE(\lambda)$ of the square root of the Laplacian on $\RR^n$ is bounded from $L^p(\RR^n)$ to $L^{p'}(\RR^n)$ for $1 \leq p \leq…

Analysis of PDEs · Mathematics 2012-05-02 Colin Guillarmou , Andrew Hassell , Adam Sikora

The restriction and Kakeya problems in Euclidean space have received much attention in the last few decades, and are related to many problems in harmonic analysis, PDE, and number theory. In this paper we initiate the study of these…

Classical Analysis and ODEs · Mathematics 2010-03-23 Gerd Mockenhaupt , Terence Tao

We establish variational estimates related to the problem of restricting the Fourier transform of a three-dimensional function to the two-dimensional Euclidean sphere. At the same time, we give a short survey of the recent field of maximal…

Classical Analysis and ODEs · Mathematics 2021-09-16 Vjekoslav Kovač , Diogo Oliveira e Silva

We prove a bilinear Kakeya inequality in the first Heisenberg group and a sharp bilinear Kakeya estimate for Euclidean curved tubes in $\R^2$. By adapting an argument of F\"assler, Pinamonti and Wald involving Heisenberg projections, we…

Classical Analysis and ODEs · Mathematics 2026-04-06 Yannis Galanos

We present a restriction theorem for the Fourier transform to a 2-dimensional conical surface of finite type, obtaining a sharp result, which improves previous work by Barcelo.

Classical Analysis and ODEs · Mathematics 2019-08-14 Stefan Buschenhenke

We prove (adjoint) bilinear restriction estimates for general phases at different scales in the full non-endpoint mixed norm range, and give bounds with a sharp and explicit dependence on the phases. These estimates have applications to…

Classical Analysis and ODEs · Mathematics 2018-04-10 Timothy Candy

In this article, we prove a bilinear estimate for Schr\"odinger equations on 2d waveguide, $\mathbb{R}\times \mathbb{T}$. We hope it may be of use in the further study of concentration compactness for cubic NLS on $\mathbb{R}\times…

Analysis of PDEs · Mathematics 2023-12-01 Yangkendi Deng

We establish improved and sharp $L^p$ estimates for the maximal bilinear Bochner-Riesz means in all dimensions $n\geq 1$. This work extends the results proved by Jeong and Lee \cite{JL}. We also recover the known results for the bilinear…

Classical Analysis and ODEs · Mathematics 2021-01-26 Jotsaroop Kaur , Saurabh Shrivastava

We prove old and new $L^p$ bounds for the quartile operator, a Walsh model of the bilinear Hilbert transform, uniformly in the parameter that models degeneration of the bilinear Hilbert transform. We obtain the full range of exponents that…

Classical Analysis and ODEs · Mathematics 2010-04-26 Richard Oberlin , Christoph Thiele

We revisit the multilinear Kakeya, curved Kakeya, restriction, and oscillatory integral estimates that were obtained in paper of Bennett, Carbery, and the author using a heat flow monotonicity method applied to a fractional Cartesian…

Classical Analysis and ODEs · Mathematics 2020-01-03 Terence Tao

Let $P$ denote the $3$-dimensional paraboloid over a finite field of odd characteristic in which $-1$ is not a square. We show that the Fourier extension operator associated with $P$ maps $L^2$ to $L^{r}$ for $r > \frac{32}{9} \approx…

Classical Analysis and ODEs · Mathematics 2026-05-14 Mark Lewko

A new decomposition for frequency-localized solutions to the Schrodinger equation is given which describes the evolution of the wavefunction using a weighted sum of Lipschitz tubes. As an application of this decomposition, we provide a new…

Analysis of PDEs · Mathematics 2015-07-28 Felipe Hernandez

Results analogous to those proved by Rubio de Francia are obtained for a class of maximal functions formed by dilations of bilinear multiplier operators of limited decay. We focus our attention to $L^2\times L^2\to L^1$ estimates. We…

Classical Analysis and ODEs · Mathematics 2018-04-27 Loukas Grafakos , Danqing He , Petr Honzík

We establish boundedness results for bilinear singular integral operators with rough homogeneous kernels whose restriction to the unit sphere belongs to the Orlicz space $L(\log L)^\alpha$. This improves the previously best known condition…

Classical Analysis and ODEs · Mathematics 2026-01-21 Georgios Dosidis , Bae Jun Park , Lenka Slavikova

If the non-commutative L p space of SLn(Z) has the completely bounded approximation property for some non-trivial value of p, then some form of the Kakeya conjecture holds in dimension d, for all d $\le$ n+1 2 . The proof relies on a…

Classical Analysis and ODEs · Mathematics 2026-02-17 Mikael de la Salle