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Complex Symmetry of Invertible Composition Operators on Weighted Bergman Spaces
Complex Analysis and Operator Theory ( IF 0.7 ) Pub Date : 2020-07-23 , DOI: 10.1007/s11785-020-01016-z
Osmar R. Severiano

In this article, we study the complex symmetry of composition operators \(C_{\phi }f=f\circ \phi \) induced on the weighted Bergman spaces \(A^2_{\beta }(\mathbb {D}),\) by analytic self-maps of the unit disk. One of our main results shows that if \(C_\phi \) is complex symmetric then \(\phi \) must fix a point in \(\mathbb {D}\). From this, we prove that if \(\phi \) is neither constant nor an elliptic automorphism of \(\mathbb {D}\) and \(C_{\phi }\) is complex symmetric then \(C_{\phi }\) and \(C_{\phi }^*\) are cyclic operators. Moreover, by assuming \(\phi \) is an elliptic automorphism of \(\mathbb {D}\) which not a rotation and \(\beta \in \mathbb {N},\) we show that \(C_{\phi }\) is not complex symmetric whenever \(\phi \) has order greater than \(2(3+\beta ).\)

中文翻译:

加权Bergman空间上可逆复合算子的复对称性。

在本文中,我们研究在加权Bergman空间\(A ^ 2 _ {\ beta}(\ mathbb {D})上诱导的合成算子\(C _ {\ phi} f = f \ circ \ phi \)的复杂对称性,\)通过分析单位磁盘的自映射。我们的主要结果之一表明,如果\(C_ \ phi \)是复对称的,那么\(\ phi \)必须在\(\ mathbb {D} \)中固定一个点。由此证明,如果\(\ phi \)既不是常数也不是\(\ mathbb {D} \)\(C _ {\ phi} \)的椭圆自同构是对称的,则\(C _ {\ phi } \)\(C _ {\ phi} ^ * \)是循环运算符。此外,通过假设\(\ phi \)\(\ mathbb {D} \)的椭圆自同构而不是旋转,而\(\ beta \ in \ mathbb {N},\)是椭圆自同构,我们证明\(C _ {\ phi} \)并非复杂对称\(\ phi \)的阶数大于\(2(3+ \ beta)。\)
更新日期:2020-07-23
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