Yuhei Suzuki
We show that, up to strong cocycle conjugacy, every countable exact group admits a unique equivariantly $\mathcal{O}_2$-absorbing, pointwise outer action on the Cuntz algebra $\mathcal{O}_2$ with the quasi-central approximation property (QAP). In particular, we establish the equivariant analogue of the Kirchberg $\mathcal{O}_2$-absorption theorem for these groups.
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We classify equivariant *-homomorphisms between C*-dynamical systems associated to actions of finite groups on C*-algebras with the Rokhlin property. In addition, the given actions are classified. An obstruction is obtained for the Cuntz semigroup of a C*-algebra allowing such an action. We also obtain an equivariant UHF-absorption result.
For a locally compact group $G$ and a strongly self-absorbing $G$-algebra $(\mathcal{D},δ)$, we obtain a new characterization of absorption of a strongly self-absorbing action using almost equivariant completely positive maps into the underlying algebra. The main technical tool to obtain this characterization is the existence of almost equivariant lifts for equivariant completely positive maps, proved in recent work of the authors. This characterization is then used to show that an equivariant $C_0(X)$-algebra with $\mathrm{dim}_{\mathrm{cov}}(X)<\infty$ is $(\mathcal{D},δ)$-stable if and only…
Equivariant $\mathcal{D}$-stability for Actions of Tensor Categories
本文为酉张量范畴在 C$^*$-代数上的作用引入等变 $\mathcal{D}$-稳定性概念，证明其等价于 $\mathcal{D}$ 到 Kirchberg 中心序列代数某子代数的单位嵌入，并据此证明一大类 AF-作用具有 $\mathcal{Z}$-稳定性。
We show an equivariant Kirchberg-Phillips-type absorption theorem for pointwise outer actions of discrete amenable groups on Kirchberg algebras with respect to natural model actions on the Cuntz algebras $\mathcal{O}_\infty$ and $\mathcal{O}_2$. This generalizes results known for finite groups and poly-$\mathbb{Z}$ groups. The model actions are shown to be determined, up to strong cocycle conjugacy, by natural abstract properties, which are verified for some examples of actions arising from tensorial shifts. We also show the following homotopy rigidity result, which may be understood as a prec…
The stable uniqueness theorem for unitary tensor category equivariant KK-theory
本文基于单位ary张量范畴的equivariant KK理论，证明了稳定性唯一性定理。
We prove that each exponential functor on the category of finite-dimensional complex inner product spaces and isomorphisms gives rise to an equivariant higher (ie. non-classical) twist of $K$-theory over $G=SU(n)$. This twist is represented by a Fell bundle $\mathcal{E} \to \mathcal{G}$, which reduces to the basic gerbe for the top exterior power functor. The groupoid $\mathcal{G}$ comes equipped with a $G$-action and an augmentation map $\mathcal{G} \to G$, that is an equivariant equivalence. The $C^*$-algebra $C^*(\mathcal{E})$ associated to $\mathcal{E}$ is stably isomorphic to the section …
We define equivariant semiprojectivity for C*-algebras equipped with actions of compact groups. We prove that the following examples are equivariantly semiprojective: arbitrary finite dimensional C*-algebras with arbitrary actions of compact groups; the Cuntz algebras ${\mathcal{O}}_d$ and extended Cuntz algebras $E_d,$ for finite $d,$ with quasifree actions of compact groups; the Cuntz algebra ${\mathcal{O}}_{\infty}$ with any quasifree action of a finite group. For actions of finite groups, we prove that equivariant semiprojectivity is equivalent to a form of equivariant stability of generat…
Let $T$ be a circle and $LT$ be its loop group. Let $\mathcal{M}$ be an infinite dimensional manifold equipped with a nice $LT$-action. We construct an analytic $LT$-equivariant index for $\mathcal{M}$, and justify it in terms of noncommutative geometry. More precisely, we construct a Hilbert space $\mathcal{H}$ consisting of "$L^2$-sections of a Clifford module bundle" and a "Dirac operator" $\mathcal{D}$ which acts on $\mathcal{H}$. Then, we define an analytic index of $\mathcal{D}$ valued in the representation group of $LT$, so called Verlinde ring. We also define a "twisted crossed product…
Equivariant (co)module nuclearity of $C^*$-crossed products
本文定义了模核性的等变与等协变版本，即 $\mathcal E$-$Γ$-核性，并证明了约化交叉积的该性质与群顺从性及完全有界逼近性质之间的等价与传递关系。
Classification of equivariantly $\mathcal{O}_2$-stable amenable actions on nuclear $\mathrm{C}^\ast$-algebras
本文研究可分稳定核$\text{C}^*$-代数上满足等距移位吸收、张量吸收$\bigcirc_2$平凡作用的顺从$G$-作用，证明其可由本原理想空间上的诱导$G$-作用在循环共轭下分类，还给出正合群的幺元版本与紧群的共轭分类结果。
Equivariant $\mathcal{Z}$-stability for single automorphisms on simple $C^*$-algebras with tractable trace simplices
本文研究迹空间为Bauer单纯形且端点边界有限维的简单核Z-稳定C*-代数上的单个自同构，证明其与Jiang-Su代数上平凡自同构的张量积余循环共轭，并对外作用给出有限Rokhlin维数及张量吸收性。
Equivariant Kirchberg-Phillips type absorption for the Razak-Jacelon algebra
本文证明简单可分核单调迹C*-代数上的强外顺从群作用在张量Razak-Jacelon代数后具有余循环共轭的唯一性，并用中心序列代数的不动点子代数给出刻画。
Let $T$ be a circle group, and $LT$ be its loop group. We hope to establish an index theory for infinite-dimensional manifolds which $LT$ acts on, including Hamiltonian $LT$-spaces, from the viewpoint of $KK$-theory. We have already constructed several objects in the previous paper \cite{T}, including a Hilbert space $\mathcal{H}$ consisting of "$L^2$-sections of a Spinor bundle on the infinite-dimensional manifold", an "$LT$-equivariant Dirac operator $\mathcal{D}$" acting on $\mathcal{H}$, a "twisted crossed product of the function algebra by $LT$", and the "twisted group $C^*$-algebra of $L…
Let $A$ be a simple infinite dimensional stably finite unital C*-algebra, and let $B$ be a centrally large subalgebra of $A$. We prove that if $A$ is tracially ${\mathcal{Z}}$-absorbing if and only if $B$ is tracially ${\mathcal{Z}}$-absorbing. If $A$ and $B$ are also separable and nuclear, we prove that $A$ is ${\mathcal{Z}}$-absorbing if and only if $B$ is ${\mathcal{Z}}$-absorbing.
Equivariant property Gamma and the tracial local-to-global principle for C*-dynamics
本文研究可数离散群作用于带迹 C*-代数的等变一致性质 Gamma，证明在顺从群和紧迹状态空间条件下该性质蕴含迹局部到整体原理，并进一步证明对简单核 $\mathcal{Z}$-稳定 C*-代数，等变一致性质 Gamma 等价于等变 $\mathcal{Z}$-稳定性。
Equivariant compactifications, trivial embeddability and finite type
针对紧李群作用，从等变紧化延拓和结构群嵌入两个角度刻画了有限型主丛，并推广了矩阵代数丛的有限型刻画；在K理论中证明了具有有限迷向群作用的等变向量丛是平凡丛的K理论因子。
This paper gives a free entropy theoretic perspective on amenable absorption results for free products of tracial von Neumann algebras. In particular, we give the first free entropy proof of Popa's famous result that the generator MASA in a free group factor is maximal amenable, and we partially recover Houdayer's results on amenable absorption and Gamma stability. Moreover, we give a unified approach to all these results using $1$-bounded entropy. We show that if $\mathcal{M} = \mathcal{P} * \mathcal{Q}$, then $\mathcal{P}$ absorbs any subalgebra of $\mathcal{M}$ that intersects it diffusely …
Equivariant Tannaka-Krein reconstruction and quantum automorphism groups of discrete structures
本文通过推广 Tannaka-Krein 重构定理，为一大类离散结构构造量子自同构群，并给出从连通局部有限离散结构得到相应范畴的方法，以量子 Cayley 图为例加以说明。
Let $T$ be the circle group and let $LT$ be its loop group. We formulate and investigate several topological aspects of the $LT$-equivariant index theory for proper $LT$-spaces, where proper $LT$-spaces are infinite-dimensional manifolds equipped with "proper cocompact" $LT$-actions. Concretely, we introduce "$\mathcal{R}KK$-theory for infinite-dimensional manifolds", and by using it, we formulate an infinite-dimensional version of the $KK$-theoretical Poincaré duality homomorphism, and an infinite-dimensional version of the $\mathcal{R}KK$-theory counterpart of the assembly map, for proper $L…
Equivariant $\mathrm{C}^*$-correspondences and compact quantum group actions on Pimsner algebras
本文研究紧量子群在 Pimsner 代数上的作用，证明等变 $\u001e C^*$-对应可自然诱导等变代数结构，并刻画 KMS 态等变性，进而用于有限有向图的量子自同构群。
Given a Fell bundle $\mathcal{B}=\{B_t\}_{t\in G}$ over a LCH group and a closed subgroup $H\subset G,$ we show that all the *-representations of $\mathcal{B}_H:=\{B_t\}_{t\in H}$ can be induced to *-representations of $\mathcal{B}$ by means of Fell's induction process; which we describe as induction via a *-homomorphism $q^{\mathcal{B}}_H\colon C^*(\mathcal{B})\to \mathbb{B}(X_{C^*(\mathcal{B}_H)}).$ The quotients $C^*_H(\mathcal{B}):=q^{\mathcal{B}}_H(C^*(\mathcal{B}))$ are intermediate to $C^*(\mathcal{B})= C^*_G(\mathcal{B})$ and $C^*_{r}(\mathcal{B})=C^*_{\{e\}}(\mathcal{B})$ because ever…
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