arXiv subjects
Publications and source records attributed to Ömer Faruk Doğan.
In this paper, via invertible radial differential operators, we characterize the closures of the harmonic Bergman Besov Spaces in the weighted harmonic Bloch spaces on the unit ball of Rn in terms of natural level sets. To this end, we first show that the harmonic Bergman Besov space is contained in the weighted harmonic little Bloch space.
We define positive Toeplitz operators between weighted harmonic Bloch spaces $b^\infty_α$ on the unit ball of $\mathbb{R}^n$ for the full range of parameter $α\in\mathbb{R}$. We give characterizations of bounded and compact Toeplitz operators taking one weighted harmonic Bloch space into a\-not\-her in terms of Carleson and vanishing Carleson measures.
We define positive Toeplitz operators between harmonic Bergman-Besov spaces $b^p_α$ on the unit ball of $\mathbb{R}^n$ for the full ranges of parameters $0<p<\infty$, $α\in\mathbb{R}$. We give characterizations of bounded and compact Toeplitz operators taking one harmonic Bergman-Besov space into another in terms of Carleson and vanishing Carleson measures. We also give characterizations for a positive Toeplitz operator on $b^{2}_α$ to be a Schatten class operator $S_{p}$ in terms of averaging functions and Berezin transforms for $1\leq p<\infty$, $α\in\mathbb{R}$. Our results extend those known for harmonic weighted Bergman spaces.
We consider a class of two-parameter weighted integral operators induced by harmonic Bergman-Besov kernels on the unit ball of $\mathbb{R}^{n}$ and characterize precisely those that are bounded from Lebesgue spaces $L^{p}_α$ into Harmonic Bergman-Besov $b^{q}_β$ or weighted Bloch Spaces $b^{\infty}_β $, for $1\leq p\leq\infty$, $1\leq q< \infty$ and $α,β\in \mathbb{R}$. These operators can be viewed as generalizations of the harmonic Bergman-Besov projections. Also, our results remove the disturbing conditions $β>-1$ when $q<\infty$ and $β\geq 0$ when $q=\infty$ of Doğan (A Class of Integral Operators Induced by Harmonic Bergman-Besov kernels on Lebesgue Classes, preprint, 2020) by mapping the operators into these spaces instead of the Lebesgue classes.
We provide a full characterization in terms of the six parameters involved the boundedness of all standard weighted integral operators induced by harmonic Bergman-Besov kernels acting between different Lebesgue classes with standard weights on the unit ball of R^{n}. These operators in some sense generalize the harmonic Bergman-Besov projections. To obtain the necessity conditions, we use a technique that heavily depends on the precise inclusion relations between harmonic Bergman-Besov and weighted Bloch spaces on the unit ball. This fruitful technique is new. It has been used first with holomorphic Bergman-Besov kernels by Kaptanoğlu and Üreyen. Methods of the sufficiency proofs we employ are Schur tests or Hölder or Minkowski type inequalities which also make use of estimates of Forelli-Rudin type integrals.
We study harmonic Besov spaces $b^p_α$ on the unit ball of $\mathbb{R}^n$, where $0<p<1$ and $α\in\mathbb{R}$. We provide characterizations in terms of partial and radial derivatives and certain radial differential operators that are more compatible with reproducing kernels of harmonic Bergman-Besov spaces. We show that the dual of harmonic Besov space $b^p_α$ is weighted Bloch space $b_β^{\infty}$ under certain volume integral pairing for $0<p<1$ and $α,β\in\mathbb{R}$. Our other results are about growth at the boundary and atomic decomposition.