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arXiv 2011.05875math.FAmath.OA
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可因子分解弱算子值框架

Factorable Weak Operator-Valued Frames

K. Mahesh Krishna, P. Sam Johnson

摘要:

设$\mathcal{H}$和$\mathcal{H}_0$是希尔伯特空间,$\{A_n\}_n$是从$\mathcal{H}$到$\mathcal{H}_0$的有界线性算子序列.希尔伯特空间的研究框架开始了对$\sum_{n=1}^{\infty}A_n^*A_n$形式的算子的研究,其中收敛是在强算子拓扑中,由Kaftal,Larson和Zhang在论文:Operator-valued frames。\textit{Trans. Amer. Math. Soc.},361(12):6349-6385,2009。在本文中,我们推广和研究系列的形式$\sum_{n=1}^{\infty}Ψ_n^*A_n$,其中$\{Ψ_n\}_n$是一个序列的运营商从$\mathcal{H}$到$\mathcal{H}_0$。研究$\sum_{n=1}^{\infty}A_n^*A_n$的主要工具是该级数的因式分解。由于系列$\sum_{n=1}^{\infty}Ψ_n^*A_n$可能未被分解,因此需要更加小心。因此,我们强加一个因子分解的$\sum_{n=1}^{\infty}Ψ_n^*A_n$,并得出各种结果。我们的特点,并得出膨胀的结果。我们进一步研究了这一系列的指标集作为群以及群状酉系统。我们也得到稳定性的结果。

英文摘要:

Let $\mathcal{H}$ and $\mathcal{H}_0$ be Hilbert spaces and $\{A_n\}_n$ be a sequence of bounded linear operators from $\mathcal{H}$ to $\mathcal{H}_0$. The study frames for Hilbert spaces initiated the study of operators of the form $\sum_{n=1}^{\infty}A_n^*A_n$, where the convergence is in the strong-operator topology, by Kaftal, Larson and Zhang in the paper: Operator-valued frames. \textit{Trans. Amer. Math. Soc.}, 361(12):6349-6385, 2009. In this paper, we generalize this and study the series of the form $\sum_{n=1}^{\infty}Ψ_n^*A_n$, where $\{Ψ_n\}_n$ is a sequence of operators from $\mathcal{H}$ to $\mathcal{H}_0$. Main tool used in the study of $\sum_{n=1}^{\infty}A_n^*A_n$ is the factorization of this series. Since the series $\sum_{n=1}^{\infty}Ψ_n^*A_n$ may not be factored, it demands greater care. Therefore we impose a factorization of $\sum_{n=1}^{\infty}Ψ_n^*A_n$ and derive various results. We characterize them and derive dilation results. We further study the series by taking the indexed set as group as well as group-like unitary system. We also derive stability results.

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