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Title: Equivalence bundles over a finite group and strong Morita equivalence for unital inclusions of unital $C^*$-algebras (English)
Author: Kodaka, Kazunori
Language: English
Journal: Mathematica Bohemica
ISSN: 0862-7959 (print)
ISSN: 2464-7136 (online)
Volume: 147
Issue: 4
Year: 2022
Pages: 435-460
Summary lang: English
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Category: math
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Summary: Let $\mathcal {A}=\{A_t \}_{t\in G}$ and $\mathcal {B}=\{B_t \}_{t\in G}$ be $C^*$-algebraic bundles over a finite group $G$. Let $C=\bigoplus _{t\in G}A_t$ and $D=\bigoplus _{t\in G}B_t$. Also, let $A=A_e$ and $B=B_e$, where $e$ is the unit element in $G$. We suppose that $C$ and $D$ are unital and $A$ and $B$ have the unit elements in $C$ and $D$, respectively. In this paper, we show that if there is an equivalence $\mathcal {A}-\mathcal {B}$-bundle over $G$ with some properties, then the unital inclusions of unital $C^*$-algebras $A\subset C$ and $B\subset D$ induced by $\mathcal {A}$ and $\mathcal {B}$ are strongly Morita equivalent. Also, we suppose that $\mathcal {A}$ and $\mathcal {B}$ are saturated and that $A' \cap C={\bf C} 1$. We show that if $A\subset C$ and $B\subset D$ are strongly Morita equivalent, then there are an automorphism $f$ of $G$ and an equivalence bundle \hbox {$\mathcal {A}-\mathcal {B}^f $}-bundle over $G$ with the above properties, where $\mathcal {B}^f$ is the $C^*$-algebraic bundle induced by $\mathcal {B}$ and $f$, which is defined by $\mathcal {B}^f =\{B_{f(t)}\}_{t\in G}$. Furthermore, we give an application.\looseness -2 (English)
Keyword: $C^*$-algebraic bundle
Keyword: equivalence bundle
Keyword: inclusions of $C^*$-algebra
Keyword: strong Morita equivalence
MSC: 46L05
MSC: 46L08
idZBL: Zbl 07655819
idMR: MR4512166
DOI: 10.21136/MB.2021.0005-21
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Date available: 2022-11-16T11:14:51Z
Last updated: 2023-04-11
Stable URL: http://hdl.handle.net/10338.dmlcz/151090
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