Pub Date : 2025-12-22DOI: 10.1016/j.jfa.2025.111321
Anh Xuan Do , Nguyen Lam , Guozhen Lu
Using techniques from harmonic analysis, we derive several sharp stability estimates for the second order Heisenberg Uncertainty Principle. We also present the explicit lower and upper bounds for the sharp stability constants and compute their exact limits when the dimension . Our proofs rely on spherical harmonics decomposition and Fourier analysis, differing significantly from existing approaches in the literature. Our results substantially improve the stability constants of the second order Heisenberg Uncertainty Principle recently obtained in [27]. As direct consequences of our main results, we also establish the sharp stability, with exact asymptotic behavior of the stability constants, of the Heisenberg Uncertainty Principle with curl-free vector fields and a sharp version of the second order Poincaré type inequality with Gaussian measure.
{"title":"Sharp stability of the Heisenberg Uncertainty Principle: Second-order and curl-free field cases","authors":"Anh Xuan Do , Nguyen Lam , Guozhen Lu","doi":"10.1016/j.jfa.2025.111321","DOIUrl":"10.1016/j.jfa.2025.111321","url":null,"abstract":"<div><div>Using techniques from harmonic analysis, we derive several sharp stability estimates for the second order Heisenberg Uncertainty Principle. We also present the explicit lower and upper bounds for the sharp stability constants and compute their exact limits when the dimension <span><math><mi>N</mi><mo>→</mo><mo>∞</mo></math></span>. Our proofs rely on spherical harmonics decomposition and Fourier analysis, differing significantly from existing approaches in the literature. Our results substantially improve the stability constants of the second order Heisenberg Uncertainty Principle recently obtained in <span><span>[27]</span></span>. As direct consequences of our main results, we also establish the sharp stability, with exact asymptotic behavior of the stability constants, of the Heisenberg Uncertainty Principle with curl-free vector fields and a sharp version of the second order Poincaré type inequality with Gaussian measure.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 7","pages":"Article 111321"},"PeriodicalIF":1.6,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1016/j.jfa.2025.111315
Yu Gu, Ran Tao
We study the half-space KPZ equation with a Neumann boundary condition, starting from stationary Brownian initial data. We derive a variance identity that links the fluctuations of the height function to the transversal fluctuations of a half-space polymer model. Utilizing this identity, we obtain estimates for the polymer endpoints, leading to optimal fluctuation exponents for the height function in both the subcritical and critical regimes, as well as an optimal upper bound for the fluctuation exponents in the extended critical regime. We also compute the average growth rate as a function of the boundary parameter.
{"title":"Fluctuation exponents of the half-space KPZ at stationarity","authors":"Yu Gu, Ran Tao","doi":"10.1016/j.jfa.2025.111315","DOIUrl":"10.1016/j.jfa.2025.111315","url":null,"abstract":"<div><div>We study the half-space KPZ equation with a Neumann boundary condition, starting from stationary Brownian initial data. We derive a variance identity that links the fluctuations of the height function to the transversal fluctuations of a half-space polymer model. Utilizing this identity, we obtain estimates for the polymer endpoints, leading to optimal fluctuation exponents for the height function in both the subcritical and critical regimes, as well as an optimal upper bound for the fluctuation exponents in the extended critical regime. We also compute the average growth rate as a function of the boundary parameter.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 7","pages":"Article 111315"},"PeriodicalIF":1.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145845558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1016/j.jfa.2025.111316
Jordy Timo van Velthoven , Felix Voigtlaender
We provide a characterization of two expansive dilation matrices yielding equal discrete anisotropic Triebel-Lizorkin spaces. For two such matrices A and B, and arbitrary and , it is shown that if and only if the set is finite, or in the trivial case when and . This provides an extension of a result by Triebel for diagonal dilations to arbitrary expansive matrices. The obtained classification of dilations is different from corresponding results for anisotropic Triebel-Lizorkin function spaces.
{"title":"Discrete Triebel-Lizorkin spaces and expansive matrices","authors":"Jordy Timo van Velthoven , Felix Voigtlaender","doi":"10.1016/j.jfa.2025.111316","DOIUrl":"10.1016/j.jfa.2025.111316","url":null,"abstract":"<div><div>We provide a characterization of two expansive dilation matrices yielding equal discrete anisotropic Triebel-Lizorkin spaces. For two such matrices <em>A</em> and <em>B</em>, and arbitrary <span><math><mi>α</mi><mo>∈</mo><mi>R</mi></math></span> and <span><math><mi>p</mi><mo>,</mo><mi>q</mi><mo>∈</mo><mo>(</mo><mn>0</mn><mo>,</mo><mo>∞</mo><mo>]</mo></math></span>, it is shown that <span><math><msubsup><mrow><mover><mrow><mi>f</mi></mrow><mrow><mo>˙</mo></mrow></mover></mrow><mrow><mi>p</mi><mo>,</mo><mi>q</mi></mrow><mrow><mi>α</mi></mrow></msubsup><mo>(</mo><mi>A</mi><mo>)</mo><mo>=</mo><msubsup><mrow><mover><mrow><mi>f</mi></mrow><mrow><mo>˙</mo></mrow></mover></mrow><mrow><mi>p</mi><mo>,</mo><mi>q</mi></mrow><mrow><mi>α</mi></mrow></msubsup><mo>(</mo><mi>B</mi><mo>)</mo></math></span> if and only if the set <span><math><mo>{</mo><msup><mrow><mi>A</mi></mrow><mrow><mi>j</mi></mrow></msup><msup><mrow><mi>B</mi></mrow><mrow><mo>−</mo><mi>j</mi></mrow></msup><mo>:</mo><mi>j</mi><mo>∈</mo><mi>Z</mi><mo>}</mo></math></span> is finite, or in the trivial case when <span><math><mo>|</mo><mi>det</mi><mo></mo><mo>(</mo><mi>A</mi><mo>)</mo><msup><mrow><mo>|</mo></mrow><mrow><mi>α</mi><mo>+</mo><mn>1</mn><mo>/</mo><mn>2</mn><mo>−</mo><mn>1</mn><mo>/</mo><mi>p</mi></mrow></msup><mo>=</mo><mo>|</mo><mi>det</mi><mo></mo><mo>(</mo><mi>B</mi><mo>)</mo><msup><mrow><mo>|</mo></mrow><mrow><mi>α</mi><mo>+</mo><mn>1</mn><mo>/</mo><mn>2</mn><mo>−</mo><mn>1</mn><mo>/</mo><mi>p</mi></mrow></msup></math></span> and <span><math><mi>p</mi><mo>=</mo><mi>q</mi></math></span>. This provides an extension of a result by Triebel for diagonal dilations to arbitrary expansive matrices. The obtained classification of dilations is different from corresponding results for anisotropic Triebel-Lizorkin function spaces.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 7","pages":"Article 111316"},"PeriodicalIF":1.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1016/j.jfa.2025.111322
Lorenz Frühwirth, Joscha Prochno
In this article, we present a precise deviation formula for the intersection of two Orlicz balls generated by Orlicz functions V and W. Additionally, we establish a (quantitative) central limit theorem in the critical case and a strong law of large numbers for the “W-norm” of the uniform distribution on . Our techniques also enable us to derive a precise formula for the thin-shell concentration of uniformly distributed random vectors in high-dimensional Orlicz balls. In our approach we establish an Edgeworth-expansion using methods from harmonic analysis together with an exponential change of measure argument.
{"title":"Sharp concentration phenomena in high-dimensional Orlicz balls","authors":"Lorenz Frühwirth, Joscha Prochno","doi":"10.1016/j.jfa.2025.111322","DOIUrl":"10.1016/j.jfa.2025.111322","url":null,"abstract":"<div><div>In this article, we present a precise deviation formula for the intersection of two Orlicz balls generated by Orlicz functions <em>V</em> and <em>W</em>. Additionally, we establish a (quantitative) central limit theorem in the critical case and a strong law of large numbers for the “<em>W</em>-norm” of the uniform distribution on <span><math><msup><mrow><mi>B</mi></mrow><mrow><mo>(</mo><mi>n</mi><mo>,</mo><mi>V</mi><mo>)</mo></mrow></msup></math></span>. Our techniques also enable us to derive a precise formula for the thin-shell concentration of uniformly distributed random vectors in high-dimensional Orlicz balls. In our approach we establish an Edgeworth-expansion using methods from harmonic analysis together with an exponential change of measure argument.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 6","pages":"Article 111322"},"PeriodicalIF":1.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present an existence and uniqueness result for weak solutions of Dirichlet boundary value problems governed by a nonlocal operator in divergence form and in the presence of a datum which is assumed to belong only to and to be suitably dominated.
We also prove that the solution that we find converges, as , to a solution of the local counterpart problem, recovering the classical result as a limit case. This requires some nontrivial customized uniform estimates and representation formulas, given that the datum is only in and therefore the usual regularity theory cannot be leveraged to our benefit in this framework.
The limit process uses a nonlocal operator, obtained as an affine transformation of a homogeneous kernel, which recovers, in the limit as , every classical operator in divergence form.
{"title":"Nonlocal operators in divergence form and existence theory for integrable data","authors":"David Arcoya , Serena Dipierro , Edoardo Proietti Lippi , Caterina Sportelli , Enrico Valdinoci","doi":"10.1016/j.jfa.2025.111317","DOIUrl":"10.1016/j.jfa.2025.111317","url":null,"abstract":"<div><div>We present an existence and uniqueness result for weak solutions of Dirichlet boundary value problems governed by a nonlocal operator in divergence form and in the presence of a datum which is assumed to belong only to <span><math><msup><mrow><mi>L</mi></mrow><mrow><mn>1</mn></mrow></msup><mo>(</mo><mi>Ω</mi><mo>)</mo></math></span> and to be suitably dominated.</div><div>We also prove that the solution that we find converges, as <span><math><mi>s</mi><mo>↗</mo><mn>1</mn></math></span>, to a solution of the local counterpart problem, recovering the classical result as a limit case. This requires some nontrivial customized uniform estimates and representation formulas, given that the datum is only in <span><math><msup><mrow><mi>L</mi></mrow><mrow><mn>1</mn></mrow></msup><mo>(</mo><mi>Ω</mi><mo>)</mo></math></span> and therefore the usual regularity theory cannot be leveraged to our benefit in this framework.</div><div>The limit process uses a nonlocal operator, obtained as an affine transformation of a homogeneous kernel, which recovers, in the limit as <span><math><mi>s</mi><mo>↗</mo><mn>1</mn></math></span>, every classical operator in divergence form.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 7","pages":"Article 111317"},"PeriodicalIF":1.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper studies the relations between extendability of different classes of Sobolev and BV functions from closed sets in general metric measure spaces. Under the assumption that the metric measure space satisfies a weak -Poincaré inequality and measure doubling, we prove further properties for the extension sets. In the case of the Euclidean plane, we show that compact finitely connected BV-extension sets are always also -extension sets. This is shown via a local quasiconvexity result for the complement of the extension set.
{"title":"Closed BV-extension and W1,1-extension sets","authors":"Emanuele Caputo , Jesse Koivu , Danka Lučić , Tapio Rajala","doi":"10.1016/j.jfa.2025.111319","DOIUrl":"10.1016/j.jfa.2025.111319","url":null,"abstract":"<div><div>This paper studies the relations between extendability of different classes of Sobolev <span><math><msup><mrow><mi>W</mi></mrow><mrow><mn>1</mn><mo>,</mo><mn>1</mn></mrow></msup></math></span> and <em>BV</em> functions from closed sets in general metric measure spaces. Under the assumption that the metric measure space satisfies a weak <span><math><mo>(</mo><mn>1</mn><mo>,</mo><mn>1</mn><mo>)</mo></math></span>-Poincaré inequality and measure doubling, we prove further properties for the extension sets. In the case of the Euclidean plane, we show that compact finitely connected <em>BV</em>-extension sets are always also <span><math><msup><mrow><mi>W</mi></mrow><mrow><mn>1</mn><mo>,</mo><mn>1</mn></mrow></msup></math></span>-extension sets. This is shown via a local quasiconvexity result for the complement of the extension set.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 7","pages":"Article 111319"},"PeriodicalIF":1.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1016/j.jfa.2025.111324
Bartosz Malman
The classical Korenblum-Roberts Theorem characterizes the cyclic singular inner functions in the Bergman spaces of the unit disk as those for which the corresponding singular measure vanishes on Beurling-Carleson sets of Lebesgue measure zero. We solve the weighted variant of the problem in which the Bergman space is replaced by a space, the closure of analytic polynomials in a Lebesgue space corresponding to a measure of the form , with being the standard weighted area measure on , dm the Lebesgue measure on the unit circle , and w a general weight on . We characterize when of this form is a space of analytic functions on by computing the Thomson decomposition of the measure μ. The structure of the decomposition is expressed in terms of what we call the family of associated Beurling-Carleson sets. We characterize the cyclic singular inner functions in the analytic spaces as those for which the corresponding singular measure vanishes on the family of associated Beurling-Carleson sets. Unlike the classical setting, Beurling-Carleson sets of both zero and positive Lebesgue measure appear in our description. As an application of our results, we complete the characterization of the symbols which generate a de Branges-Rovnyak space with a dense subset of functions smooth on . The characterization is given explicitly in terms of the modulus of b on and the singular measure corresponding to the singular inner factor of b. Our proofs involve Khrushchev's techniques of simultaneous polynomial approximations and linear programming ideas of Korenblum, combined with recently established constrained -optimization tools.
{"title":"Weighted Korenblum-Roberts theory","authors":"Bartosz Malman","doi":"10.1016/j.jfa.2025.111324","DOIUrl":"10.1016/j.jfa.2025.111324","url":null,"abstract":"<div><div>The classical Korenblum-Roberts Theorem characterizes the cyclic singular inner functions in the Bergman spaces of the unit disk <span><math><mi>D</mi></math></span> as those for which the corresponding singular measure vanishes on Beurling-Carleson sets of Lebesgue measure zero. We solve the weighted variant of the problem in which the Bergman space is replaced by a <span><math><msup><mrow><mi>P</mi></mrow><mrow><mi>t</mi></mrow></msup><mo>(</mo><mi>μ</mi><mo>)</mo></math></span> space, the closure of analytic polynomials in a Lebesgue space <span><math><msup><mrow><mi>L</mi></mrow><mrow><mi>t</mi></mrow></msup><mo>(</mo><mi>μ</mi><mo>)</mo></math></span> corresponding to a measure of the form <span><math><mi>d</mi><msub><mrow><mi>A</mi></mrow><mrow><mi>α</mi></mrow></msub><mo>+</mo><mi>w</mi><mspace></mspace><mi>d</mi><mtext>m</mtext></math></span>, with <span><math><mi>d</mi><msub><mrow><mi>A</mi></mrow><mrow><mi>α</mi></mrow></msub></math></span> being the standard weighted area measure on <span><math><mi>D</mi></math></span>, <em>dm</em> the Lebesgue measure on the unit circle <span><math><mi>T</mi></math></span>, and <em>w</em> a general weight on <span><math><mi>T</mi></math></span>. We characterize when <span><math><msup><mrow><mi>P</mi></mrow><mrow><mi>t</mi></mrow></msup><mo>(</mo><mi>μ</mi><mo>)</mo></math></span> of this form is a space of analytic functions on <span><math><mi>D</mi></math></span> by computing the Thomson decomposition of the measure <em>μ</em>. The structure of the decomposition is expressed in terms of what we call the family of <em>associated Beurling-Carleson sets</em>. We characterize the cyclic singular inner functions in the analytic <span><math><msup><mrow><mi>P</mi></mrow><mrow><mi>t</mi></mrow></msup><mo>(</mo><mi>μ</mi><mo>)</mo></math></span> spaces as those for which the corresponding singular measure vanishes on the family of associated Beurling-Carleson sets. Unlike the classical setting, Beurling-Carleson sets of both zero and positive Lebesgue measure appear in our description. As an application of our results, we complete the characterization of the symbols <span><math><mi>b</mi><mo>:</mo><mi>D</mi><mo>→</mo><mi>D</mi></math></span> which generate a de Branges-Rovnyak space with a dense subset of functions smooth on <span><math><mi>T</mi></math></span>. The characterization is given explicitly in terms of the modulus of <em>b</em> on <span><math><mi>T</mi></math></span> and the singular measure corresponding to the singular inner factor of <em>b</em>. Our proofs involve Khrushchev's techniques of simultaneous polynomial approximations and linear programming ideas of Korenblum, combined with recently established constrained <span><math><msup><mrow><mi>L</mi></mrow><mrow><mn>1</mn></mrow></msup></math></span>-optimization tools.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 7","pages":"Article 111324"},"PeriodicalIF":1.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Schauder frames of discrete translates in L2(R)","authors":"Nir Lev , Anton Tselishchev","doi":"10.1016/j.jfa.2025.111318","DOIUrl":"10.1016/j.jfa.2025.111318","url":null,"abstract":"<div><div>We construct a uniformly discrete sequence <span><math><mo>{</mo><msub><mrow><mi>λ</mi></mrow><mrow><mn>1</mn></mrow></msub><mo><</mo><msub><mrow><mi>λ</mi></mrow><mrow><mn>2</mn></mrow></msub><mo><</mo><mo>⋯</mo><mo>}</mo><mo>⊂</mo><mi>R</mi></math></span> and functions <em>g</em> and <span><math><mo>{</mo><msubsup><mrow><mi>g</mi></mrow><mrow><mi>n</mi></mrow><mrow><mo>⁎</mo></mrow></msubsup><mo>}</mo></math></span> in <span><math><msup><mrow><mi>L</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>(</mo><mi>R</mi><mo>)</mo></math></span>, such that every <span><math><mi>f</mi><mo>∈</mo><msup><mrow><mi>L</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>(</mo><mi>R</mi><mo>)</mo></math></span> admits a series expansion<span><span><span><math><mi>f</mi><mo>(</mo><mi>x</mi><mo>)</mo><mo>=</mo><munderover><mo>∑</mo><mrow><mi>n</mi><mo>=</mo><mn>1</mn></mrow><mrow><mo>∞</mo></mrow></munderover><mo>〈</mo><mi>f</mi><mo>,</mo><msubsup><mrow><mi>g</mi></mrow><mrow><mi>n</mi></mrow><mrow><mo>⁎</mo></mrow></msubsup><mo>〉</mo><mspace></mspace><mi>g</mi><mo>(</mo><mi>x</mi><mo>−</mo><msub><mrow><mi>λ</mi></mrow><mrow><mi>n</mi></mrow></msub><mo>)</mo></math></span></span></span> convergent in the <span><math><msup><mrow><mi>L</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>(</mo><mi>R</mi><mo>)</mo></math></span> norm.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 7","pages":"Article 111318"},"PeriodicalIF":1.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145845559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-19DOI: 10.1016/j.jfa.2025.111323
The Anh Bui , Xuan Thinh Duong , Fu Ken Ly
Let be the Hermite operator on . For a bounded function , we can define the Hermite pseudo-multipliers formally by setting where is the orthogonal projection of onto the k-th eigenspace of corresponding to the eigenvalue . In this paper, we consider new conditions on m for which may not possess any kernel regularity. For such pseudo-multipliers we establish their boundedness on various function spaces including weighted Lebesgue spaces, BMO and Hardy spaces associated to . In the scale of the weighted Lebesgue spaces, our results improve those in [Bagchi & Thangavelu, J. Funct. Anal. 2015].
设H是Rn上的厄米算子。对于有界函数m:Rn×R→C,我们可以通过设m(x,H)=∑k=0∞m(x,2k+n)Pk来正式定义Hermite伪乘子m(x,H),其中Pk是L2(Rn)在H的第k个特征空间上对应于特征值2k+n的正交投影。本文考虑m上m(x,H)不具有核正则性的新条件。对于这些伪乘子,我们建立了它们在各种函数空间上的有界性,包括加权Lebesgue空间、BMO和与h相关的Hardy空间。在加权Lebesgue空间的尺度上,我们的结果改进了[Bagchi &; Thangavelu, J. Funct]中的结果。肛交,2015]。
{"title":"On Hermite pseudo–multipliers with non-smooth kernels","authors":"The Anh Bui , Xuan Thinh Duong , Fu Ken Ly","doi":"10.1016/j.jfa.2025.111323","DOIUrl":"10.1016/j.jfa.2025.111323","url":null,"abstract":"<div><div>Let <span><math><mi>H</mi></math></span> be the Hermite operator on <span><math><msup><mrow><mi>R</mi></mrow><mrow><mi>n</mi></mrow></msup></math></span>. For a bounded function <span><math><mi>m</mi><mo>:</mo><msup><mrow><mi>R</mi></mrow><mrow><mi>n</mi></mrow></msup><mo>×</mo><mi>R</mi><mo>→</mo><mi>C</mi></math></span>, we can define the Hermite pseudo-multipliers <span><math><mi>m</mi><mo>(</mo><mi>x</mi><mo>,</mo><mi>H</mi><mo>)</mo></math></span> formally by setting<span><span><span><math><mi>m</mi><mo>(</mo><mi>x</mi><mo>,</mo><mi>H</mi><mo>)</mo><mo>=</mo><munderover><mo>∑</mo><mrow><mi>k</mi><mo>=</mo><mn>0</mn></mrow><mrow><mo>∞</mo></mrow></munderover><mi>m</mi><mo>(</mo><mi>x</mi><mo>,</mo><mn>2</mn><mi>k</mi><mo>+</mo><mi>n</mi><mo>)</mo><msub><mrow><mi>P</mi></mrow><mrow><mi>k</mi></mrow></msub><mo>,</mo></math></span></span></span> where <span><math><msub><mrow><mi>P</mi></mrow><mrow><mi>k</mi></mrow></msub></math></span> is the orthogonal projection of <span><math><msup><mrow><mi>L</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>(</mo><msup><mrow><mi>R</mi></mrow><mrow><mi>n</mi></mrow></msup><mo>)</mo></math></span> onto the <em>k</em>-th eigenspace of <span><math><mi>H</mi></math></span> corresponding to the eigenvalue <span><math><mn>2</mn><mi>k</mi><mo>+</mo><mi>n</mi></math></span>. In this paper, we consider new conditions on <em>m</em> for which <span><math><mi>m</mi><mo>(</mo><mi>x</mi><mo>,</mo><mi>H</mi><mo>)</mo></math></span> may not possess any kernel regularity. For such pseudo-multipliers we establish their boundedness on various function spaces including weighted Lebesgue spaces, BMO and Hardy spaces associated to <span><math><mi>H</mi></math></span>. In the scale of the weighted Lebesgue spaces, our results improve those in [Bagchi & Thangavelu, J. Funct. Anal. 2015].</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 7","pages":"Article 111323"},"PeriodicalIF":1.6,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145882891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-17DOI: 10.1016/j.jfa.2025.111307
Moshe Marcus
Consider Schrödinger operators in a bounded Lipschitz domain . Assume that satisfies and a subcriticality condition that guarantees the existence of a ground state . We derive sharp estimates of signed superharmonic functions that possess an boundary trace, i.e., a measure boundary trace associated with . Using these estimates we derive a-priori estimates of positive solutions of a related semilinear boundary value problem.
{"title":"Estimates of Green and Martin integrals of Schrödinger equations and a semilinear boundary value problem","authors":"Moshe Marcus","doi":"10.1016/j.jfa.2025.111307","DOIUrl":"10.1016/j.jfa.2025.111307","url":null,"abstract":"<div><div>Consider Schrödinger operators <span><math><msup><mrow><mi>L</mi></mrow><mrow><mi>V</mi></mrow></msup><mo>:</mo><mo>=</mo><mi>Δ</mi><mo>+</mo><mi>V</mi></math></span> in a bounded Lipschitz domain <span><math><mi>Ω</mi><mo>⊂</mo><msup><mrow><mi>R</mi></mrow><mrow><mi>N</mi></mrow></msup></math></span>. Assume that <span><math><mi>V</mi><mo>∈</mo><msup><mrow><mi>C</mi></mrow><mrow><mn>1</mn></mrow></msup><mo>(</mo><mi>Ω</mi><mo>)</mo></math></span> satisfies <span><math><mi>V</mi><mo>(</mo><mi>x</mi><mo>)</mo><mo>≤</mo><mover><mrow><mi>a</mi></mrow><mrow><mo>¯</mo></mrow></mover><mspace></mspace><mrow><mi>dist</mi></mrow><mspace></mspace><msup><mrow><mo>(</mo><mi>x</mi><mo>,</mo><mo>∂</mo><mi>Ω</mi><mo>)</mo></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></math></span> and a subcriticality condition that guarantees the existence of a ground state <span><math><msub><mrow><mi>Φ</mi></mrow><mrow><mi>V</mi></mrow></msub></math></span>. We derive sharp estimates of signed <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>V</mi></mrow></msub></math></span> superharmonic functions that possess an <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>V</mi></mrow></msub></math></span> boundary trace, i.e., a measure boundary trace associated with <span><math><msub><mrow><mi>L</mi></mrow><mrow><mi>V</mi></mrow></msub></math></span>. Using these estimates we derive a-priori estimates of positive solutions of a related semilinear boundary value problem.</div></div>","PeriodicalId":15750,"journal":{"name":"Journal of Functional Analysis","volume":"290 6","pages":"Article 111307"},"PeriodicalIF":1.6,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}