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
We consider the numerical range of a bounded weighted composition operator on the Fock space , where the entire function φ must have the form az + b with a and b in and . We obtain necessary and sufficient conditions for to be a subset of the interior of the numerical range of , 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 when .
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 在福克空间 ,其中整个函数φ的形式必须为az + b,其中a和b为 和 。我们获得了必要的充分条件 成为内部数字范围的子集 ,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 什么时候 。