Kaplansky-Hilbert 模上酉群表示的分解定理与 Furstenberg-Zimmer 结构定理
A Decomposition Theorem for Unitary Group Representations on Kaplansky-Hilbert Modules and the Furstenberg-Zimmer Structure Theorem
AI总结:
本文建立了 Stone 代数上 Kaplansky-Hilbert 模的酉群表示分解定理,并基于算子理论将其应用于推广著名的 Furstenberg-Zimmer 结构定理至任意群在任意概率空间上的保测作用情形。
摘要:
本文建立了 Stone 代数上 Kaplansky-Hilbert 模的(协变)酉群表示分解定理,推广了著名的 Hilbert 空间情形(此时与 Jacobs、de Leeuw 和 Glicksberg 的分解一致)。证明严重依赖 Kaplansky-Hilbert 模上的算子理论,特别是此类模上 Hilbert-Schmidt 同态的谱定理。作为应用,将著名的 Furstenberg-Zimmer 结构定理推广到任意群在任意概率空间上的保测作用情形。
英文摘要:
In this paper, a decomposition theorem for (covariant) unitary group representations on Kaplansky-Hilbert modules over Stone algebras is established, which generalizes the well-known Hilbert space case (where it coincides with the decomposition of Jacobs, de Leeuw and Glicksberg). The proof rests heavily on the operator theory on Kaplansky-Hilbert modules, in particular the spectral theorem for Hilbert-Schmidt homomorphisms on such modules. As an application, a generalization of the celebrated Furstenberg-Zimmer structure theorem to the case of measure-preserving actions of arbitrary groups on arbitrary probability spaces is established.
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