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arXiv 0907.1129math.OAmath.FA
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2-图C* 代数的自同态与模理论

Endomorphisms and Modular Theory of 2-Graph C*-Algebras

Dilian Yang

摘要:

本文研究了单顶点2-图$\Fth$的图C* 代数$Ø_θ$的自同态和模理论。证明了$Ø_θ$的酉自同态与它的酉对与\textit{twisted property}之间存在半群同构.我们刻画了自同态保持规范自同构的不动点代数$\fF$及其正则masa $\fD$的条件。还研究了自同态的其他一些性质。关于$Ø_θ$的模理论,我们证明了由$Ø_θ$的生成元生成的代数 *-代数是模Hilbert代数.因此,我们得到由$ω$的GNS表示生成的冯诺依曼代数$π(Ø_θ)"$是III型$_1$的AFD因子,条件是$\frac{\ln m}{\ln n}\not\in\bQ$。这里$m,n$分别是度为$(1,0)$和$(0,1)$的$\Fth$的生成元的数目。这项工作是Davidson-Power-Yang的\cite{DPY1, DPY2}和Davidson-Yang的\cite{DY}的延续。

英文摘要:

In this paper, we initiate the study of endomorphisms and modular theory of the graph C*-algebras $Ø_θ$of a 2-graph $\Fth$ on a single vertex. We prove that there is a semigroup isomorphism between unital endomorphisms of $Ø_θ$ and its unitary pairs with a \textit{twisted property}. We characterize when endomorphisms preserve the fixed point algebra $\fF$ of the gauge automorphisms and its canonical masa $\fD$. Some other properties of endomorphisms are also investigated. As far as the modular theory of $Ø_θ$ is concerned, we show that the algebraic *-algebra generated by the generators of $Ø_θ$ with the inner product induced from a distinguished state $ω$ is a modular Hilbert algebra. Consequently, we obtain that the von Neumann algebra $π(Ø_θ)"$ generated by the GNS representation of $ω$ is an AFD factor of type III$_1$, provided $\frac{\ln m}{\ln n}\not\in\bQ$. Here $m,n$ are the numbers of generators of $\Fth$ of degree $(1,0)$ and $(0,1)$, respectively. This work is a continuation of \cite{DPY1, DPY2} by Davidson-Power-Yang and \cite{DY} by Davidson-Yang.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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