非交换支盖和束单可化性

Alexandru Chirvasitu
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引用次数: 0

摘要

我们证明:(a) 在紧凑可元胞$X$上的连续单素次均质$C^*$束的截面空间允许有限指数期望到$C(X)$上,这回答了布兰查德-戈吉(Blanchard-Gogi\'{c})的一个问题(在可元胞情况下);(b) 一般来说,这种期望不可能有 "最优指数",这否定地回答了同一问题的一个变体;(c) 在局部准紧密基空间 $X$ 上的同质连续巴纳赫(Banach)束可以以这样的方式重整为希尔伯特(Hilbert)束,即原来的有界部分空间是$C_b(X)$线性巴纳赫-马祖尔(Banach-Mazur)-接近于在连续有界函数 $X$ 上的代数$C_b(X)$上得到的希尔伯特模块。这最后一个结果定量地解决了 Gogi\'{c} 提出的另一个问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Non-commutative branched covers and bundle unitarizability
We prove that (a) the sections space of a continuous unital subhomogeneous $C^*$ bundle over compact metrizable $X$ admits a finite-index expectation onto $C(X)$, answering a question of Blanchard-Gogi\'{c} (in the metrizable case); (b) such expectations cannot, generally, have ``optimal index'', answering negatively a variant of the same question; and (c) a homogeneous continuous Banach bundle over a locally paracompact base space $X$ can be renormed into a Hilbert bundle in such a manner that the original space of bounded sections is $C_b(X)$-linearly Banach-Mazur-close to the resulting Hilbert module over the algebra $C_b(X)$ of continuous bounded functions on $X$. This last result resolves quantitatively another problem posed by Gogi\'{c}.
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