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We present a brief survey of recent results on boundedness of some classical operators within the frameworks of weighted spaces $L^{p(\cdot)}(\varrho)$ with variable exponent $p(x)$, mainly in the Euclidean setting and dwell on a new result…

Functional Analysis · Mathematics 2008-05-15 V. Kokilashvili , S. Samko

In this paper, we continue the study of a class of second order elliptic operators of the form $\mathcal L=\mbox{div}(A\nabla\cdot)$ in a domain above a Lipschitz graph in $\mathbb R^n,$ where the coefficients of the matrix $A$ satisfy a…

Analysis of PDEs · Mathematics 2022-12-02 Martin Dindoš , Steve Hofmann , Jill Pipher

We prove uniform $L^p$ bounds for multilinear operators which are given by multipliers whose symbols are singular on a one dimensional subspace. The novelty is that these bounds are uniform in the choice of the subspace.

Classical Analysis and ODEs · Mathematics 2007-05-23 Camil Muscalu , Terence Tao , Christoph Thiele

We prove that the generalized Carleson operator with polynomial phase function of degree two is of weak type (2,2). For this, we introduce a new approach to the time-frequency analysis of the quadratic phase.

Classical Analysis and ODEs · Mathematics 2008-09-06 Victor Lie

The goal of this paper is to provide a new approach to address the $L^p-$boundedness of bilinear rough singular integral operators. This approach relies on local Fourier series expansion of input functions leading to trilinear estimates…

Classical Analysis and ODEs · Mathematics 2025-08-27 Ankit Bhojak , Saurabh Shrivastava

In this work, we develop $L^p$ boundedness theory for pseudodifferential operators with rough (not even continuous in general) symbols in the $x$ variable. Moreover, the $B(L^p)$ operator norms are estimated explicitly in terms of scale…

Classical Analysis and ODEs · Mathematics 2007-05-23 Atanas Stefanov

The present paper, along with its sequel, establishes the correspondence between the properties of the solutions of a class of PDEs and the geometry of sets in Euclidean space. We settle the question of whether (quantitative) absolute…

Analysis of PDEs · Mathematics 2020-01-15 Steve Hofmann , José María Martell , Svitlana Mayboroda , Tatiana Toro , Zihui Zhao

By means of appropriate sparse bounds, we deduce compactness on weighted $L^p(w)$ spaces, $1<p<\infty$, for all Calder\'on-Zygmund operators having compact extensions on $L^2(\mathbb{R}^n)$. Similar methods lead to new results on…

Classical Analysis and ODEs · Mathematics 2024-07-23 Cody B. Stockdale , Paco Villarroya , Brett D. Wick

For a sequence of complex numbers $\Lambda$ we consider the restriction operator $R_{\Lambda}$ defined on Paley-Wiener spaces $PW_{\tau}^{p}$ ($1<p<\infty$). Lyubarskii and Seip gave necessary and sufficient conditions on $\Lambda$ for…

Complex Variables · Mathematics 2012-08-22 Frederic Gaunard

The present paper, along with its companion [Hofmann, Martell, Mayboroda, Toro, Zhao, arXiv:1710.06157], establishes the correspondence between the properties of the solutions of a class of PDEs and the geometry of sets in Euclidean space.…

Analysis of PDEs · Mathematics 2020-01-08 Steve Hofmann , José María Martell , Svitlana Mayboroda , Tatiana Toro , Zihui Zhao

In this note we study sharp sufficient conditions for the nuclearity of Fourier integral operators on $L^p$-spaces, $1< p\leq 2$. Our conditions and those presented in Cardona [2] provide a systematic investigation on the subject for all…

Spectral Theory · Mathematics 2018-09-12 Duván Cardona

In one-sided Chord-Arc Domains $\Omega$, we demonstrate that the $A_\infty$-absolute continuity of the elliptic measure with respect to the surface measure remains stable under $L^2$ Carleson perturbations. This stability holds provided…

Analysis of PDEs · Mathematics 2025-08-05 Joseph Feneuil

We consider harmonic functions in the unit ball of $\mathbb{R}^{n+1}$ that are unbounded near the boundary but can be estimated from above by some (rapidly increasing) radial weight $w$. Our main result gives some conditions on $w$ that…

Classical Analysis and ODEs · Mathematics 2016-03-24 A. Logunov , E. Malinnikova , P. Mozolyako

This paper investigates the $L^p$ boundedness of wave operators for the Laplace operator with finite rank perturbations \begin{equation*} H=-\Delta+\sum\limits_{i=1}^N\langle\cdot\,, \varphi_i\rangle \varphi_i \qquad \mbox{on}\,\,\, \R^d.…

Analysis of PDEs · Mathematics 2025-08-08 Han Cheng , Shanlin Huang , Avy Soffer , Zhao Wu

We prove the solvability of the parabolic $L^p$ Dirichlet boundary value problem for $1 < p \leq \infty$ for a PDE of the form $u_t = \mbox{div} (A \nabla u) + B \cdot \nabla u$ on time-varying domains where the coefficients $A= [a_{ij}(X,…

Analysis of PDEs · Mathematics 2020-06-17 Martin Dindoš , Luke Dyer , Sukjung Hwang

We investigate the Hilbert transform and the maximal operator along a class of variable non-flat polynomial curves $(P(t),u(x)t)$ with measurable $u(x)$, and prove uniform $L^p$ estimates for $1<p<\infty$. In particular, via the change of…

Classical Analysis and ODEs · Mathematics 2023-06-01 Renhui Wan

Let $G=N\rtimes \mathbb{R}$, where $N$ is a Carnot group and $\mathbb{R}$ acts on $N$ via automorphic dilations. Homogeneous left-invariant sub-Laplacians on $N$ and $\mathbb{R}$ can be lifted to $G$, and their sum is a left-invariant…

Functional Analysis · Mathematics 2024-09-23 Alessio Martini , Paweł Plewa

We extend Carleson's formula to radially polynomially weighted Dirichlet spaces.

Complex Variables · Mathematics 2023-01-25 Brahim Bouya , Andreas Hartmann

We provide a Fefferman-Stein type weighted inequality for maximally modulated Calder\'on-Zygmund operators that satisfy \textit{a priori} weak type unweighted estimates. This inequality corresponds to a maximally modulated version of a…

Classical Analysis and ODEs · Mathematics 2017-09-15 David Beltran

We generalize to the setting of 1-sided chord-arc domains, that is, to domains satisfying the interior Corkscrew and Harnack Chain conditions (these are respectively scale-invariant/quantitative versions of the openness and…

Classical Analysis and ODEs · Mathematics 2020-08-13 Juan Cavero , Steve Hofmann , José María Martell , Tatiana Toro
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