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Let $\mathcal{L}$ be the special Hermite operator on $\mathbb{C}^n$. As a continuation of the recent results in \cite{SG}, we establish new Strichartz estimates for systems of orthonormal functions associated with general flows of the form…

Functional Analysis · Mathematics 2025-11-24 Sunit Ghosh , Jitendriya Swain

In this paper, we prove restriction theorems for the Fourier-Laguerre transform and establish Strichartz estimates for the Schr\"{o}dinger propagator $e^{-itL_\alpha}$ for the Laguerre operator…

Functional Analysis · Mathematics 2022-05-24 Guoxia Feng , Manli Song

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

We consider the $H^{s}$--$L^q$ maximal estimates associated to the wave operator \begin{equation*} e^{ it\sqrt{-\Delta}}f(x) = \frac{1}{(2\pi)^d}\int_{\mathbb{R}^d} e^{i(x \cdot \xi \, + t|\xi|)} \widehat{f}(\xi\,) d\xi. \end{equation*}…

Classical Analysis and ODEs · Mathematics 2025-09-16 Chu-Hee Cho , Sanghyuk Lee , Wenjuan Li

Recently, two of the authors obtained estimates for the adjoint restriction operator to finite type curves with respect to general measures. Strikingly, it turns out that some of such estimates are sharp, especially when the measures are…

Classical Analysis and ODEs · Mathematics 2019-11-04 Seheon Ham , Hyerim Ko , Sanghyuk Lee

Using tools from the theory of operator ideals and s-numbers, we develop a general approach to transfer estimates for $L_2$ -approximation of Sobolev functions into estimates for $L_\infty$-approximation, with precise control of all…

Functional Analysis · Mathematics 2015-05-12 Fernando Cobos , Thomas Kühn , Winfried Sickel

In our companion paper (S.N. Chandler Wilde, D.P. Hewett, A. Moiola, Sobolev spaces on non-Lipschitz subsets of $\mathbb{R}^n$ with application to boundary integral equations on fractal screens, 2016) we studied a number of different…

Functional Analysis · Mathematics 2022-08-29 David P. Hewett , Andrea Moiola

The restriction problem is better understood for hypersurfaces and recent progresses have been made by bilinear and multilinear approaches and most recently polynomial partitioning method which is combined with those estimates. However, for…

Classical Analysis and ODEs · Mathematics 2019-03-13 Juyoung Lee , Sanghyuk Lee

In this article, we prove the restriction theorem for the Fourier-Hermite transform and obtain the Strichartz estimate for the system of orthonormal functions for the Hermite operator $H=-\Delta+|x|^2$ on $\mathbb{R}^n$ as application.…

Functional Analysis · Mathematics 2022-03-08 Shyam Swarup Mondal , Jitendriya Swain

We prove mixed norm space-time estimates for solutions of the Schroedinger equation, with initial data in $L^p$ Sobolev or Besov spaces, and clarify the relation with adjoint restriction.

Analysis of PDEs · Mathematics 2016-04-20 Sanghyuk Lee , Keith M. Rogers , Andreas Seeger

We consider restriction analogues on hypersurfaces of the uniform Sobolev inequalities in Kenig, Ruiz, and Sogge and the resolvent estimates in Dos Santos Ferreira, Kenig, and Salo.

Analysis of PDEs · Mathematics 2024-11-08 Matthew D. Blair , Chamsol Park

Conditional on Fourier restriction estimates for elliptic hypersurfaces, we prove optimal restriction estimates for polynomial hypersurfaces of revolution for which the defining polynomial has non-negative coefficients. In particular, we…

Classical Analysis and ODEs · Mathematics 2017-10-24 Betsy Stovall

Given a self-adjoint involution J on a Hilbert space H, we consider a J-self-adjoint operator L=A+V on H where A is a possibly unbounded self-adjoint operator commuting with J and V a bounded J-self-adjoint operator anti-commuting with J.…

Spectral Theory · Mathematics 2011-10-31 Sergio Albeverio , Alexander K. Motovilov , Christiane Tretter

We prove $L^p$-$L^q$-estimates for the Restriction-Extension operator acting on block-radial functions with the aid of new oscillatory integral estimates and interpolation results in mixed Lorentz spaces. Similar techniques apply to the…

Analysis of PDEs · Mathematics 2025-07-01 Rainer Mandel

We consider an abstract non-negative self-adjoint operator $H$ on an $L^2$-space. We derive a characterization for the restriction estimate $\| dE_H(\lambda) \|_{L^p \to L^{p'}} \le C \lambda^{\frac{d}{2}(\frac{1}{p} - \frac{1}{p'}) -1}$ in…

Classical Analysis and ODEs · Mathematics 2013-04-15 Frederic Bernicot , El Maati Ouhabaz

We give almost sharp conditions under which the maximal operator associated with the wave equation with initial data in Sobolev space H^s(R^n) is bounded from H^s(R^n) to L^q(R^n).

Classical Analysis and ODEs · Mathematics 2009-11-13 Keith Rogers , Francisco Villarroya

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

In this paper we consider adjoint restriction estimates for space curves with respect to general measures and obtain optimal estimates when the curves satisfy a finite type condition. The argument here is new in that it doesn't rely on the…

Classical Analysis and ODEs · Mathematics 2015-03-17 Seheon Ham , Sanghyuk Lee

In this note we provide estimates for the lower bound of the self-adjoint operator associated with the three-coefficient Sturm-Liouville differential expression $$ \frac{1}{r} \left(-\frac{\mathrm d}{\mathrm dx} p \frac{\mathrm d}{\mathrm…

Spectral Theory · Mathematics 2022-12-21 Jussi Behrndt , Fritz Gesztesy , Philipp Schmitz , Carsten Trunk

Using recent work of Bourgain-Dyatlov we show that for any convex co-compact hyperbolic surface Strichartz estimates for the Schr\"odinger equation hold with an arbitrarily small loss of regularity.

Analysis of PDEs · Mathematics 2017-07-21 Jian Wang
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