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In this article, we address endpoint issues for the bilinear spherical maximal functions. We obtain borderline restricted weak type estimates for the well studied bilinear spherical maximal function…

Classical Analysis and ODEs · Mathematics 2024-01-17 Ankit Bhojak , Surjeet Singh Choudhary , Saurabh Shrivastava , Kalachand Shuin

We show new local $L^p$-smoothing estimates for the Schr\"odinger equation with initial data in modulation spaces via decoupling inequalities. Furthermore, we probe necessary conditions by Knapp-type examples for space-time estimates of…

Analysis of PDEs · Mathematics 2022-02-04 Robert Schippa

Almost everywhere convergence on the solution of Schr\"odinger equation is an important problem raised by Carleson in harmonic analysis. In recent years, this problem was essentially solved by building the sharp $L^p$-estimate of…

Analysis of PDEs · Mathematics 2023-12-12 Zhenbin Cao , Changxing Miao , Meng Wang

Using Guth's polynomial partitioning method, we obtain $L^p$ estimates for the maximal function associated to the solution of Schr\"odinger equation in $\mathbb R^2$. The $L^p$ estimates can be used to recover the previous best known result…

Classical Analysis and ODEs · Mathematics 2016-11-10 Xiumin Du , Xiaochun Li

Let $L$ be a non-negative self-adjoint operator acting on $L^2(X)$ where $X$ is a space of homogeneous type with a dimension $n$. In this paper, we study sharp endpoint $L^p$-Sobolev estimates for the solution of the initial value problem…

Analysis of PDEs · Mathematics 2022-04-18 Peng Chen , Xuan Thinh Duong , Zhijie Fan , Ji Li , Lixin Yan

We study the maximal regularity problem for abstract time-fractional Schr\"odinger equations $\partial_t^\alpha(u-u_0) -\mathrm{i} A u=f$, with a fractional derivative $\partial_t^\alpha$ of order $\alpha \in (0,1)$. We assume that $A$ is a…

Analysis of PDEs · Mathematics 2026-03-18 S. E. Chorfi , F. Et-tahri , L. Maniar , M. Yamamoto

In this paper, we consider the convergence problem of Schr\"odinger equation. Firstly, we show the almost everywhere pointwise convergence of Schr\"odinger equation in Fourier-Lebesgue spaces…

Analysis of PDEs · Mathematics 2021-01-13 Xiangqian Yan , Yajuan Zhao , Wei Yan

Let $L$ be a non-negative self-adjoint operator acting on $L^2(X)$ where $X$ is a space of homogeneous type with a dimension $n$. Suppose that the heat operator $e^{-tL}$ satisfies the generalized Gaussian $(p_0, p'_0)$-estimates of order…

Classical Analysis and ODEs · Mathematics 2020-05-07 Peng Chen , Xuan Thinh Duong , Ji Li , Lixin Yan

For the one-dimensional Schr\"odinger equation, we obtain sharp maximal-in-time and maximal-in-space estimates for systems of orthonormal initial data. The maximal-in-time estimates generalize a classical result of Kenig--Ponce--Vega and…

Analysis of PDEs · Mathematics 2019-09-16 Neal Bez , Sanghyuk Lee , Shohei Nakamura

In this paper, we consider the maximal estimates for the solution to an initial value problem of the linear Schroedinger equation with a singular potential. We show a result about the pointwise convergence of solutions to this special…

Analysis of PDEs · Mathematics 2015-06-25 Changxing Miao , Junyong Zhang , Jiqiang Zheng

In this paper, we combine the argument of [12] and [27] to prove the maximal estimates for fractional Schr\"odinger equations $(i\partial_t+\mathcal{L}_{\mathbf{A}}^{\frac\alpha 2})u=0$ in the purely magnetic fields which includes the…

Analysis of PDEs · Mathematics 2022-01-06 Haoran Wang , Jiye Yuan

We prove a dispersive estimate for the one-dimensional Schroedinger equation, mapping between weighted $L^p$ spaces with stronger time-decay ($t^{-3/2}$ versus $t^{-1/2}$) than is possible on unweighted spaces. To satisfy this bound, the…

Analysis of PDEs · Mathematics 2015-04-23 Michael Goldberg

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

One of the most celebrated problems in Euclidean Harmonic analysis is the Carleson's problem: determining the optimal regularity of the initial condition $f$ of the Schr\"odinger equation given by \begin{equation*} \begin{cases}…

Analysis of PDEs · Mathematics 2025-01-15 Utsav Dewan

We study $L^p$ boundedness of the maximal average over dilations of a smooth hypersurface $S$. When the decay rate of the Fourier transform of a measure on $S$ is $1/2$, we establish the optimal maximal bound, which settles the conjecture…

Classical Analysis and ODEs · Mathematics 2025-01-03 Sewook Oh

In this paper, we studied the space-time estimates for the solution to the Schr\"odinger equation. By polynomial partitioning, induction arguments, bilinear to linear arguments and broad norm estimates, we set up several maximal estimates…

Classical Analysis and ODEs · Mathematics 2024-02-22 Junfeng Li , Changxing Miao , Ankang Yu

In this paper, we consider the Cauchy problem for the fractional Schr\"odinger equation $i D_t^\alpha u + (-\Delta)^{\frac{\beta}{2}} u =0$ with $0<\alpha<1$, $\beta>0$. We establish the dispersive estimates for the solutions. In…

Analysis of PDEs · Mathematics 2019-01-07 Xiaoyan Su , Shiliang Zhao , Miao Li

We study pointwise convergence of the fractional Schr\"odinger means along sequences $t_n$ which converge to zero. Our main result is that bounds on the maximal function $\sup_{n} |e^{it_n(-\Delta)^{\alpha/2}} f| $ can be deduced from those…

Classical Analysis and ODEs · Mathematics 2022-07-20 Chu-Hee Cho , Hyerim Ko , Youngwoo Koh , Sanghyuk Lee

In this paper, we first show that there exists a maximizer for the non-endpoint Strichartz inequalities for the Schr\"odinger equation in all dimensions based on the recent linear profile decomposition results. We then present a new proof…

Analysis of PDEs · Mathematics 2008-10-12 Shuanglin Shao

We show various $L^p$ estimates for Schr\"odinger operators $-\Delta+V$ on $\RR^n$ and their square roots. We assume reverse H\"older estimates on the potential, and improve some results of Shen \cite{Sh1}. Our main tools are improved…

Analysis of PDEs · Mathematics 2007-05-23 Pascal Auscher , Besma Ben Ali
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