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Numerical range of weighted composition operators on the Fock space
Complex Variables and Elliptic Equations ( IF 0.9 ) Pub Date : 2021-02-23 , DOI: 10.1080/17476933.2021.1890053
Mahmood Haji Shaabani 1 , Mahsa Fatehi 2 , Christopher N. B. Hammond 3
Affiliation  

We consider the numerical range of a bounded weighted composition operator Cψ,φ on the Fock space F2, where the entire function φ must have the form az + b with a and b in C and |a|1. We obtain necessary and sufficient conditions for {ψ(p)an:nis a non-negative integer} to be a subset of the interior of the numerical range of Cψ,φ, where p is the fixed point of φ. We characterize when 0 belongs to the numerical range of a weighted composition operator and determine which weighted composition operators have numerical ranges with no corner points. Furthermore, we describe the corner points of the closure of the numerical range of a compact weighted composition operator. Moreover, we precisely determine the numerical range of Cψ,φ when |a|=1.



中文翻译:

Fock空间上加权合成算子的数值范围

我们考虑有界加权合成算子的数值范围 Cψφ 在福克空间 F2,其中整个函数φ的形式必须为az  +  b,其中abC|一种|1个。我们获得了必要的充分条件{ψp一种ññ是一个非负整数} 成为内部数字范围的子集 Cψφ,其中p是的固定点φ。我们表征0何时属于加权合成算子的数值范围,并确定哪些加权合成算子具有不带角点的数值范围。此外,我们描述了紧凑加权合成算子的数值范围的闭合角点。而且,我们精确地确定了Cψφ 什么时候 |一种|=1个

更新日期:2021-02-24
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