Endpoint regularity of general Fourier integral operators

Xiangrong Zhu, Wenjuan Li
{"title":"Endpoint regularity of general Fourier integral operators","authors":"Xiangrong Zhu, Wenjuan Li","doi":"arxiv-2408.15280","DOIUrl":null,"url":null,"abstract":"Let $n\\geq 1,0<\\rho<1, \\max\\{\\rho,1-\\rho\\}\\leq \\delta\\leq 1$ and\n$$m_1=\\rho-n+(n-1)\\min\\{\\frac 12,\\rho\\}+\\frac {1-\\delta}{2}.$$ If the amplitude\n$a$ belongs to the H\\\"{o}rmander class $S^{m_1}_{\\rho,\\delta}$ and $\\phi\\in\n\\Phi^{2}$ satisfies the strong non-degeneracy condition, then we prove that the\nfollowing Fourier integral operator $T_{\\phi,a}$ defined by \\begin{align*}\nT_{\\phi,a}f(x)=\\int_{\\mathbb{R}^{n}}e^{i\\phi(x,\\xi)}a(x,\\xi)\\widehat{f}(\\xi)d\\xi,\n\\end{align*} is bounded from the local Hardy space $h^1(\\mathbb{R}^n)$ to\n$L^1(\\mathbb{R}^n)$. As a corollary, we can also obtain the corresponding\n$L^p(\\mathbb{R}^n)$-boundedness when $1<p<2$. These theorems are rigorous improvements on the recent works of Staubach and\nhis collaborators. When $0\\leq \\rho\\leq 1,\\delta\\leq \\max\\{\\rho,1-\\rho\\}$, by\nusing some similar techniques in this note, we can get the corresponding\ntheorems which coincide with the known results.","PeriodicalId":501145,"journal":{"name":"arXiv - MATH - Classical Analysis and ODEs","volume":"43 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - MATH - Classical Analysis and ODEs","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2408.15280","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract

Let $n\geq 1,0<\rho<1, \max\{\rho,1-\rho\}\leq \delta\leq 1$ and $$m_1=\rho-n+(n-1)\min\{\frac 12,\rho\}+\frac {1-\delta}{2}.$$ If the amplitude $a$ belongs to the H\"{o}rmander class $S^{m_1}_{\rho,\delta}$ and $\phi\in \Phi^{2}$ satisfies the strong non-degeneracy condition, then we prove that the following Fourier integral operator $T_{\phi,a}$ defined by \begin{align*} T_{\phi,a}f(x)=\int_{\mathbb{R}^{n}}e^{i\phi(x,\xi)}a(x,\xi)\widehat{f}(\xi)d\xi, \end{align*} is bounded from the local Hardy space $h^1(\mathbb{R}^n)$ to $L^1(\mathbb{R}^n)$. As a corollary, we can also obtain the corresponding $L^p(\mathbb{R}^n)$-boundedness when $1
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一般傅里叶积分算子的端点正则性
让 $ngeq 1,0<\rho<1, \max\{\rho,1-\rho\} leadq \delta\leq 1$ and$m_1=\rho-n+(n-1)\min\{frac 12,\rho\}+\frac {1-\delta}{2}。如果振幅 $a$ 属于 H\"{o}rmander 类 $S^{m_1}_{\rho,\delta}$,并且 $\phi\in\Phi^{2}$ 满足强非退化条件,那么我们证明下面的傅里叶积分算子 $T_{\phi、a}$ 定义为 \begin{align*}T_{\phi,a}f(x)=\int_{\mathbb{R}^{n}}e^{i\phi(x,\xi)}a(x,\xi)\widehat{f}(\xi)d\xi、\end{align*} 从局部哈代空间 $h^1(\mathbb{R}^n)$ 到$L^1(\mathbb{R}^n)$ 是有界的。作为推论,当 1
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