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Journal of Pseudo-Differential Operators and Applications最新文献

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Toeplitz operators and composition operators on the q-Bergman space q 伯格曼空间上的托普利兹算子和组成算子
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-02-10 DOI: 10.1007/s11868-023-00583-x
Houcine Sadraoui, Borhen Halouani
{"title":"Toeplitz operators and composition operators on the q-Bergman space","authors":"Houcine Sadraoui, Borhen Halouani","doi":"10.1007/s11868-023-00583-x","DOIUrl":"https://doi.org/10.1007/s11868-023-00583-x","url":null,"abstract":"<p>In this work we consider Toeplitz operators and composition operators on the <i>q</i>-Bergman space.We give some spectral properties of Toeplitz operators in general and a sufficient condition for hyponormality of Toeplitz operators in the case of a symbol where the analytic part is a monomial. We also give a necessary condition for hyponormality in the general case of a harmonic symbol as well as a necessary and sufficient condition for such operators to commute. For composition operators we give necessary conditions and sufficient conditions for their compactness and normality, as well as necessary conditions for cohyponormality in the case of a linear fractional map and we finally compute the adjoint in the case of a linear map.\u0000</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"9 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mass concentration phenomenon in the 3D bipolar compressible Navier–Stokes–Poisson system 三维双极可压缩纳维-斯托克斯-泊松系统中的质量集中现象
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-02-10 DOI: 10.1007/s11868-023-00582-y
{"title":"Mass concentration phenomenon in the 3D bipolar compressible Navier–Stokes–Poisson system","authors":"","doi":"10.1007/s11868-023-00582-y","DOIUrl":"https://doi.org/10.1007/s11868-023-00582-y","url":null,"abstract":"<h3>Abstract</h3> <p>In this paper, we investigate the blow-up mechanism to the bipolar compressible Navier–Stokes–Poisson system in three dimensions. It is essentially shown that the mass of the model will concentrate in some spatial points, even if the initial density contains vacuum states, provided that the smooth solution develops singularity in finite time.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"221 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Geodetically convex sets in the Heisenberg group $${mathbb {H}}^n$$ , $$n ge 1$$ 海森堡群中的大地凸集 $${mathbb {H}}^n$$ , $$n ge 1$$
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-02-10 DOI: 10.1007/s11868-023-00581-z
Jyotshana V. Prajapat, Anoop Varghese
{"title":"Geodetically convex sets in the Heisenberg group $${mathbb {H}}^n$$ , $$n ge 1$$","authors":"Jyotshana V. Prajapat, Anoop Varghese","doi":"10.1007/s11868-023-00581-z","DOIUrl":"https://doi.org/10.1007/s11868-023-00581-z","url":null,"abstract":"<p>A geodetically convex set in the Heisenberg group <span>({mathbb {H}}^n)</span>, <span>(nge 1)</span> is defined to be a set with the property that a geodesic joining any two points in the set lies completely in it. Here we classify the geodetically convex sets to be either an empty set, a singleton set, an arc of a geodesic or the whole space <span>({mathbb {H}}^n)</span>. We also show that a geodetically convex function on <span>({mathbb {H}}^n)</span>is a constant function. These results generalize the known results of <span>({mathbb {H}}^1)</span> to higher dimensional Heisenberg group.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"106 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An extension of localization operators 本地化算子的扩展
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-02-10 DOI: 10.1007/s11868-023-00584-w
Paolo Boggiatto, Gianluca Garello
{"title":"An extension of localization operators","authors":"Paolo Boggiatto, Gianluca Garello","doi":"10.1007/s11868-023-00584-w","DOIUrl":"https://doi.org/10.1007/s11868-023-00584-w","url":null,"abstract":"<p>We review at first the role of localization operators as a meeting point of three different areas of research, namely: signal analysis, quantization and pseudo-differential operators. We extend then the correspondence between symbol and operator which characterizes localization operators to a more general situation, introducing the class of <i>bilocalization operators</i>. We show that this enlargement yields a quantization rule that is closed under composition. Some boundedness results are deduced both for localization and bilocalization operators. In particular for bilocalization operators we prove that square integrable symbols yield bounded operators on <span>(L^2)</span> and that the class of bilocalization operators with integrable symbols is a subalgebra of bounded operators on every fixed modulation space.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"88 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Molecular decompositions of homogeneous Besov type spaces for Laguerre function expansions and applications 用于拉盖尔函数展开的同质贝索夫类型空间的分子分解及其应用
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-02-10 DOI: 10.1007/s11868-024-00587-1
He Wang, Nan Zhao, Haihui Wang, Yu Liu
{"title":"Molecular decompositions of homogeneous Besov type spaces for Laguerre function expansions and applications","authors":"He Wang, Nan Zhao, Haihui Wang, Yu Liu","doi":"10.1007/s11868-024-00587-1","DOIUrl":"https://doi.org/10.1007/s11868-024-00587-1","url":null,"abstract":"<p>In this paper we consider the Laguerre operator <span>(L=-frac{d^2}{dx^2}-frac{alpha }{x}frac{d}{dx}+x^2)</span> on the Euclidean space <span>(mathbb R_{+})</span>. The main aim of this article is to develop a theory of homogeneous Besov type spaces associated to the Laguerre operator. To achieve our expected goals, Schwartz type spaces on <span>(mathbb R_{+})</span> are introduced and then tempered type distributions are constructed. Using a suitable distribution of the Laguerre operator, the Calderón reproducing formula and the Harnack type inequality for subharmonic functions are established. With these tools in hand, we define the Besov type spaces <span>(dot{B}_{p,q}^{s,L,m})</span> and obtain the molecular decompositions of <span>(dot{B}_{p,q}^{s,L,m})</span>. As applications, the embedding theorem and square functions characterization of Besov type spaces <span>(dot{B}_{p,q}^{s,L,m})</span> are also investigated.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"116 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new approach to neural networks using pseudo-differential operators 使用伪微分算子的神经网络新方法
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-01-21 DOI: 10.1007/s11868-023-00580-0
Hang Du, Shahla Molahajloo, Xiaogang Wang
{"title":"A new approach to neural networks using pseudo-differential operators","authors":"Hang Du, Shahla Molahajloo, Xiaogang Wang","doi":"10.1007/s11868-023-00580-0","DOIUrl":"https://doi.org/10.1007/s11868-023-00580-0","url":null,"abstract":"<p>In this paper, we initially concentrate on the concept of complex convolutional neural networks, constructing the essential frameworks required for managing complex-valued inputs. We subsequently introduce a novel neural network architecture that replaces the standard convolution operator with a more general operator known as pseudo-differential operators. This unique modification ensures the effective handling of an input’s frequency information through the application of appropriate filters. To validate this approach, we conducted empirical testing on one-dimensional and two-dimensional datasets. The results affirm the convergence and efficacy of this novel architecture, indicating a potential significant advancement in the field of complex neural network development.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"235 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139515323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Boundedness of multilinear pseudo-differential operators with $$S_{0,0}$$ class symbols on Besov spaces 贝索夫空间上具有 $$S_{0,0}$ 类符号的多线性伪微分算子的有界性
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-01-16 DOI: 10.1007/s11868-023-00579-7
Naoto Shida
{"title":"Boundedness of multilinear pseudo-differential operators with $$S_{0,0}$$ class symbols on Besov spaces","authors":"Naoto Shida","doi":"10.1007/s11868-023-00579-7","DOIUrl":"https://doi.org/10.1007/s11868-023-00579-7","url":null,"abstract":"<p>We consider multilinear pseudo-differential operators with symbols in the multilinear Hörmander class <span>(S_{0, 0})</span>. The aim of this paper is to discuss the boundedness of these operators in the settings of Besov spaces.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"36 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139476725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimal semiclassical spectral asymptotics for differential operators with non-smooth coefficients 具有非光滑系数的微分算子的最优半经典谱渐近法
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-01-16 DOI: 10.1007/s11868-023-00572-0
Søren Mikkelsen
{"title":"Optimal semiclassical spectral asymptotics for differential operators with non-smooth coefficients","authors":"Søren Mikkelsen","doi":"10.1007/s11868-023-00572-0","DOIUrl":"https://doi.org/10.1007/s11868-023-00572-0","url":null,"abstract":"<p>We consider differential operators defined as Friedrichs extensions of quadratic forms with non-smooth coefficients. We prove a two-term optimal asymptotic for the Riesz means of these operators and thereby also reprove an optimal Weyl law under certain regularity conditions. The methods used are then extended to consider more general admissible operators perturbed by a rough differential operator and to obtain optimal spectral asymptotics again under certain regularity conditions. For the Weyl law, we assume that the coefficients are differentiable with Hölder continuous derivatives, while for the Riesz means we assume that the coefficients are twice differentiable with Hölder continuous derivatives.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"11 5 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139476591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Weak solvability and well-posedness of some fractional parabolic problems with vanishing initial datum 一些初始基准消失的分数抛物问题的弱可解性和良好求解性
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2024-01-03 DOI: 10.1007/s11868-023-00578-8
{"title":"Weak solvability and well-posedness of some fractional parabolic problems with vanishing initial datum","authors":"","doi":"10.1007/s11868-023-00578-8","DOIUrl":"https://doi.org/10.1007/s11868-023-00578-8","url":null,"abstract":"<h3>Abstract</h3> <p>This paper tackles a class of nonlinear parabolic equations driven by the fractional <em>p</em>-Laplacian operator with a vanishing initial datum. Our primary aim is to investigate the well-posedness (existence and uniqueness) of solutions to the proposed model. Notably, we will establish two interesting results concerning the existence and uniqueness of weak solutions. The first result pertains to the scenario where the source term is independent of the solution. In this case, we demonstrate the existence and uniqueness of the solution via the classical monotone operator theory modulus vanishing initial datum. The second result deals with the case where the source term is nonlinear and strongly dependent on the solution. To establish the existence of a weak solution in this scenario, we will rely essentially on the use of Schaefer’s fixed point theorem and supplement our approach with some new technical estimates.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139094767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Further investigation of stochastic nonlinear Hilfer-fractional integro-differential inclusions using almost sectorial operators 利用近似扇形算子进一步研究随机非线性希尔费分积分微分夹杂物
IF 1.1 3区 数学
Journal of Pseudo-Differential Operators and Applications Pub Date : 2023-12-12 DOI: 10.1007/s11868-023-00577-9
Hasanen A. Hammad, Hassen Aydi, Doha A. Kattan
{"title":"Further investigation of stochastic nonlinear Hilfer-fractional integro-differential inclusions using almost sectorial operators","authors":"Hasanen A. Hammad, Hassen Aydi, Doha A. Kattan","doi":"10.1007/s11868-023-00577-9","DOIUrl":"https://doi.org/10.1007/s11868-023-00577-9","url":null,"abstract":"<p>The purpose of this work is to develop a new model of fractional operators called Hilfer-fractional random nonlinear integro-differential equations. In this paradigm, a further discussion is encouraged under almost sectorial operators. The results are supported by fractional calculus, stochastic analysis theory, and Bohnenblust–Karlin’s fixed point theorem for multi-valued mappings. In addition, a mild solution to the model under consideration is presented. Ultimately, an example is provided to support our results.</p>","PeriodicalId":48793,"journal":{"name":"Journal of Pseudo-Differential Operators and Applications","volume":"78 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138574654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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