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arXiv math/0512044math.FAmath.CV
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紧加权复合算子与凸区域中的不动点

Compact weighted composition operators and fixed points in convex domains

Dana D. Clahane

摘要:

我们推广了Caughran/Schwartz的一个经典结果和Gunatillake的另一个最近结果,证明了:如果D是n维复空间中的有界凸区域,m是D上的一个全纯函数,且从零向D的边界有界,p是一个全纯自D的一个映射,使得将m与f和p的复合的乘积赋给给定函数f的加权复合算子W在全纯泛函上是紧的D上的希尔伯特空间(密集包含多项式函数),再生核K沿着D的对角线向其边界爆破,则p在D中具有唯一的不动点。我们应用这一结果作出合理的猜想的频谱W的基础上以前的一个变量和多变量的结果紧凑的加权和不加权的组合算子。

英文摘要:

We extend a classical result of Caughran/Schwartz and another recent result of Gunatillake by showing that if D is a bounded, convex domain in n-dimensional complex space, m is a holomorphic function on D and bounded away from zero toward the boundary of D, and p is a holomorphic self-map of D such that the weighted composition operator W assigning the product of m and the composition of f and p to a given function f is compact on a holomorphic functional Hilbert space (containing the polynomial functions densely) on D with reproducing kernel K blowing up along the diagonal of D toward its boundary, then p has a unique fixed point in D. We apply this result by making a reasonable conjecture about the spectrum of W based on previous one-variable and multivariable results concerning compact weighted and unweighted composition operators.

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