S. Thangavelu
Using Gutzmer's formula, due to Lassalle, we characterise the image of Sobolev spaces under the Segal-Bargmann transform on compact Riemannian symmetric spaces.
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Holomorphic removability is of importance in dynanical systems theory. P.W.Jones found that Sobolev removability can serve as a substitute. He proved a strong strong result for Hölder domains. The present work gives some results on the this and related matters.
Algebras of pseudo-differential operators acting on holomorphic Sobolev spaces
该研究在闭实解析黎曼流形、带双不变度量的李群及对应Grauert管上的全纯Sobolev空间框架下，刻画了满足全纯Sobolev映射性质的伪微分算子代数，包括拉普拉斯及解析伪微分算子交换子类，还在李群情形下得到由全局矩阵值符号确定的更大代数并刻画其椭圆元。
In this note we investigate the image of Sobolev spaces of fractional order on a compact Lie group $ K $ under the Segal-Bargmann transform. We show that the image can be characterised in terms of certain weighted Bergman spaces of holomorphic functions on the complexification extending a theorem of Hall and Lewkeeratiyutkul. We also treat the heat kernel transform associated to the Hermite operator.
The images of Hermite and Laguerre Sobolev spaces under the Hermite and special Hermite semigroups (respectively) are characterised. These are used to characterise the Schwartz class of rapidly decreasing functions. The image of the space of all tempered distributions is also considered and a Paley-Wiener theorem for the windowed Fourier transform is proved.
We show that for a hypoelliptic Dirichlet form operator A on a stratified complex Lie group, if the logarithmic Sobolev inequality holds, then a holomorphic projection of A is strongly hypercontractive in the sense of Janson. This extends previous results of Gross to a setting in which the operator A is not holomorphic.
Compact Sobolev embeddings of radially symmetric functions
本文研究了径向对称函数在不同空间中的Sobolev嵌入紧致性，提出了新的技术并给出了加权情况下的最优目标空间。
For a smoothly bounded strictly pseudoconvex domain, we describe the boundary singularity of weighted Bergman kernels with respect to weights behaving like a power (possibly fractional) of a defining function, and, more generally, of the reproducing kernels of Sobolev spaces of holomorphic functions of any real order. This generalizes the classical result of Fefferman for the unweighted Bergman kernel. Finally, we also exhibit a holomorphic continuation of the kernels with respect to the Sobolev parameter to the entire complex plane. Our main tool are the generalized Toeplitz operators of Bout…
The Extended Paley-Wiener Theorem over the Hardy-Sobolev Spaces
本文通过全纯傅里叶变换研究平方可积函数子空间，建立了Hardy-Sobolev空间上的扩展Paley-Wiener定理，并探讨了圆盘与上半平面的联系。
A characterization of the subspace of radially symmetric functions in Sobolev spaces
该研究通过径向剖面的加权Sobolev范数等价刻画径向对称函数的Sobolev空间，并将结果用于描述共旋映射的范数。
A form of Sobolev inequalities for the symmetric gradient of vector-valued functions is proposed, which allows for arbitrary ground domains in $\mathbb R ^n$. In the relevant inequalities, boundary regularity of domains is replaced with information on boundary traces of trial functions. The inequalities so obtained exhibit the same exponents as in classical inequalities for the full gradient of Sobolev functions, in regular domains. Furthermore, they involve constants independent of the geometry of the domain, and hence yield novel results yet for smooth domains. Our approach relies upon a poi…
A note on non-local Sobolev spaces and non-local perimeters
本文研究由积分核定义的非局部Sobolev空间，证明延拓结果、Sobolev与Poincaré不等式及非局部周长等周不等式，并讨论核非径向对称时的非局部等周问题。
We show that the first order Sobolev spaces on cuspidal symmetric domains can be characterized via pointwise inequalities. In particular, they coincide with the Hajlasz-Sobolev spaces.
A Survey on Invariant Spaces of Holomorphic Functions on Symmetric Domains
本文综述了对称域上全纯函数不变空间的研究，涵盖加权伯格曼空间、Hardy空间等，并重点探讨了Hilbert和半Hilbert空间，同时讨论了最小和最大空间。
Invariant Spaces of Holomorphic Functions on Symmetric Siegel domains
本文研究了对称塞格尔域上的全纯函数的不变空间，通过分类仿射不变半希尔伯特空间并改进莫比乌斯不变半希尔伯特空间的分类，揭示了其在一般域上的结构。
Around the Sobolev Inequalities for the Stable Heat Semigroups
本文建立了与非退化对称α-稳定概率测度相关的分数阶各向异性Sobolev空间的一般分布理论，并围绕其稳定热半群研究Sobolev不等式。
Let $f$ be a Paley-Wiener function in the space $L_{2}(X)$, where $X$ is a symmetric space of noncompact type. It is shown that by using the values of $f$ on a sufficiently dense and separated set of points of $X$ one can give an exact formula for the Helgason-Fourier transform of $f$. In order to find a discrete approximation to the Helgason-Fourier transform of a function from a Besov space on $X$ we develop an approximation theory by Paley-Wiener functions in $L_{2}(X)$.
We study some spectral properties of Volterra-type integral operators $V_g$ and $I_g$ with holomorphic symbol $g$ on the Fock--Sobolev spaces $\mathcal{F}_{ψ_m}^p$. We showed that $V_g$ is bounded on $\mathcal{F}_{ψ_m}^p$ if and only if $g$ is a complex polynomial of degree not exceeding two, while compactness of $V_g$ is described by degree of $g$ being not bigger than one. We also identified all those positive numbers $p$ for which the operator $V_g$ belongs to the Schatten $\mathcal{S}_p$ classes. Finally, we characterize the spectrum of $V_g$ in terms of a closed disk of radius twice the c…
We study the operator $\mathcal{A}$ of multiplication by an independent variable in a matrix Sobolev space $W^2(M)$. In the cases of finite measures on $[a,b]$ with $(2\times 2)$ and $(3\times 3)$ real continuous matrix weights of full rank it is shown that the operator $\mathcal{A}$ is symmetrizable. Namely, there exist two symmetric operators $\mathcal{B}$ and $\mathcal{C}$ in a larger space such that $\mathcal{A} f = \mathcal{C} \mathcal{B}^{-1} f$, $f\in D(\mathcal{A})$. As a corollary, we obtain some new orthogonality conditions for the associated Sobolev orthogonal polynomials. These con…
A Sobolev type embedding for radially symmetric functions on the unit ball $B$ in $\mathbb R^n$, $n\geq 3$, into the variable exponent Lebesgue space $L_{2^\star + |x|^α} (B)$, $2^\star = 2n/(n-2)$, $α>0$, is known due to J.M. do Ó, B. Ruf, and P. Ubilla, namely, the inequality \[ \sup\Big\{\int_B |u(x)|^{2^\star+|x|^α} dx : u\in H^1_{0,{\rm rad}}(B), \|\nabla u\|_{L^2(B)} =1\Big\} < +\infty \] holds. In this work, we generalize the above inequality for higher order Sobolev spaces of radially symmetric functions on $B$, namely, the embedding \[ H^m_{0,{\rm rad}}(B) \hookrightarrow L_{2_m^\star…
It is known that all the vector bundles of the title can be obtained by holomorphic induction from representations of a certain parabolic group on finite dimensional inner product spaces. The representations, and the induced bundles, have composition series with irreducible factors. We give a condition under which the bundle and the direct sum of its irreducible constituents are intertwined by an equivariant constant coefficient differential operator. We show that in the case of the unit ball in $\mathbb C^2$ this condition is always satisfied. As an application we show that all homogeneous pa…
It is known that all the vector bundles of the title can be obtained by holomorphic induction from representations of a certain parabolic Lie algebra on finite dimensional inner product spaces. The representations, and the induced bundles, have composition series with irreducible factors. Our first main result is the construction of an explicit differential operator intertwining the bundle with the direct sum of its factors. Next, we study Hilbert spaces of sections of these bundles. We use this to get, in particular, a full description and a similarity theorem for homogeneous $n$-tuples of op…
We establish sharp Adams type inequalities on Sobolev spaces $W^{α, n/α}(X)$ of any fractional order $α< n$ on Riemannian symmetric space $X$ of noncompact type with dimension $n$ and of arbitrary rank. We also establish sharp Hardy-Adams inequalities on the Sobolev spaces $W^{n/2, 2}(X)$. For the real hyperbolic spaces, such results were recently obtained by J. Li et al. (Trans. AMS, 2020). We use Fourier analysis on the symmetric spaces to obtain these results.
Time frequency localization in the Fourier Symmetric Sobolev space
研究傅里叶对称Sobolev空间中的集中算子，发现Bargmann变换将该空间映射到加权Fock空间，并揭示了双侧集中算子特征值衰减的非经典现象。
We prove compactness of the embeddings in Sobolev spaces for fractional super and sub harmonic functions with radial symmetry. The main tool is a pointwise decay for radially symmetric functions belonging to a function space defined by finite homogeneous Sobolev norm together with finite $L^2$ norm of the Riesz potentials. As a byproduct we prove also existence of maximizers for the interpolation inequalities in Sobolev spaces for radially symmetric fractional super and sub harmonic functions.
Linear extension operators for Sobolev spaces on radially-symmetric binary trees
本文研究径向对称二叉树上叶子函数的最小加权 $W^{1,p}$ 延拓问题，证明存在范数仅依赖 $p$ 的线性算子，即关于由 $p$ 与权重确定的 Markov 核的调和延拓。
We establish an equivalency of the Corona problem (1962) and Gleason problem (1964) in the theory of several complex variables. As an application, we give an affirmative solution of the Corona problem for certain bounded pseudoconvex domains or polydomains including balls and polydiscs. Indeed, we extend our recent work on Gleason problem based on the functional analytic approach, as well as extend recent work of Clos. We also use this equivalency or else other (functional analytic) methods to affirmatively solve both problems for various Banach spaces of bounded holomorphic functions (includi…
Analytic aspects of the dilation inequality for symmetric convex sets in Euclidean spaces
本文探讨欧几里得空间中对称凸集膨胀不等式的解析形式，证明其等价于对称拟凸函数相对熵的界，并由此研究多个相关不等式，通过有界扰动与张量化构造满足该不等式的新概率测度。
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