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arXiv 2609.22685math.OA

$C^*$-极端映射与从$C(X)$到有限von Neumann代数的$*$-同态

$C^*$-extreme maps and $*$-homomorphisms from $C(X)$ to finite von Neumann algebras

Dimitrios Giannakis, Michael Montgomery, Travis Russell

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中文总结 AI 辅助

本文研究固定子代数$\mathcal C$的单位完全正映射的极端点,证明在交换域和具有正规忠实中心值迹的有限von Neumann代数中,极端点恰为固定$\mathcal C$的$*$-同态,推广了Farenick和Morenz的经典结果。

中文摘要 AI 辅助

给定$C^*$-代数的单位包含$\nmathcal C \subset \mathcal A$以及到von Neumann代数$\mathcal B$的单位包含$\mathcal C \subset \mathcal B$,我们研究从$\mathcal A$到$\mathcal B$的固定$\mathcal C$的单位完全正映射的极端点,记为$UCP_\mathcal C(\mathcal A, \mathcal B)$。该空间显然是凸的,并且关于$C^*$-代数$\mathcal C' \cap \mathcal B$是$C^*$-凸的。在本文中,我们证明当$\mathcal A$是交换的且$\mathcal B$具有正规忠实的中心值迹时,$\mathcal C' \cap \mathcal B$-极端点恰好是固定$\mathcal C$的$*$-同态。这推广了Farenick和Morenz的结果,其中$\mathcal C = \mathbb C 1$且$\mathcal B = M_n(\mathbb C)$。

英文摘要

Given a unital inclusion of $C^*$-algebras $\mathcal C \subset \mathcal A$ and a unital inclusion $\mathcal C \subset \mathcal B$ into a von Neumann algebra $\mathcal B$, we investigate the extreme points of unital completely positive maps from $\mathcal A$ to $\mathcal B$ that fix $\mathcal C$ denoted by $UCP_\mathcal C(\mathcal A, \mathcal B)$. This space is obviously convex and $C^*$-convex with respect to the $C^*$-algebra $\mathcal C' \cap \mathcal B$. In this article we show that the $\mathcal C' \cap \mathcal B$-extreme points are exactly the $*$-homomorphisms that fix $\mathcal C$ when $\mathcal A$ is commutative and $\mathcal B$ has a normal faithful center valued trace. This generalizes a result due to Farenick and Morenz where $\mathcal C = \mathbb C 1$ and $\mathcal B = M_n(\mathbb C)$.

发表机构

  • Dartmouth College(达特茅斯学院)
  • Cascade Quantum(Cascade量子)
  • Texas Christian University(德克萨斯基督教大学)

机构由 AI 辅助整理,请以论文原文为准。

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