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arXiv 2004.09985math.FAmath.CV
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无界Toeplitz算子的核与符号分解

Kernels of unbounded Toeplitz operators and factorization of symbols

M. Cristina Câmara, M. Teresa Malheiro, Jonathan R. Partington

摘要:

我们考虑核的无界Toeplitz算子在$H^p(\mathbb C^+)$在其符号的因式分解。研究了$H^p(\mathbb C^+)$中包含给定函数的最小Toeplitz核的存在性,描述了符号具有涉及两个不同Hardy空间的某种因子分解的Toeplitz算子的核,并建立了符号相差一个因子的两个算子的核之间的关系,该因子在单位圆内对应于$z$的非整数次幂.我们应用这些结果来描述具有非零分段连续符号的Toeplitz算子的核。

英文摘要:

We consider kernels of unbounded Toeplitz operators in $H^p(\mathbb C^+)$ in terms of a factorization of their symbols. We study the existence of a minimal Toeplitz kernel containing a given function in $H^p(\mathbb C^+)$, we describe the kernels of Toeplitz operators whose symbol possesses a certain factorization involving two different Hardy spaces and we establish relations between the kernels of two operators whose symbols differ by a factor which corresponds, in the unit circle, to a non-integer power of $z$. We apply the results to describe the kernels of Toeplitz operators with non-vanishing piecewise continuous symbols.

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