Michael Mueger
We show that the author's notion of Galois extensions of braided tensor categories [22], see also [3], gives rise to braided crossed G-categories, recently introduced for the purposes of 3-manifold topology [31]. The Galois extensions C \rtimes S are studied in detail, and we determine for which g in G non-trivial objects of grade g exist in C \rtimes S.
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If $Γ$ is a group, then braided $Γ$-crossed modules are classified by braided strict $Γ$-graded categorial groups. The Schreier theory obtained for $Γ$-module extensions of the type of an abelian $Γ$-crossed module is a generalization of the theory of $Γ$-module extensions.
In this paper we study the categories of braided categorical associative algebras and braided crossed modules of associative algebras and we relate these structures with the categories of braided categorical Lie algebras and braided crossed modules of Lie algebras.
In this paper we study the category of braided categorical Leibniz algebras and braided crossed modules of Leibniz algebras and we relate these structures with the categories of braided categorical Lie algebras and braided crossed modules of Lie algebras using the Loday-Pirashvili category.
For a finite braided tensor category we introduce its Picard crossed module consisting of the group of invertible module categories and the group of braided tensor autoequivalences. We describe the Picard crossed module in terms of braided autoequivalences of the Drinfeld center of the braided tensor category. As an illustration, we compute the Picard crossed module of a braided pointed fusion category.
We introduce, for a symmetric fusion category $\mathcal{A}$ with Drinfeld centre $\mathcal{Z}(\mathcal{A})$, the notion of $\mathcal{Z}(\mathcal{A})$-crossed braided tensor category. These are categories that are enriched over $\mathcal{Z}(\mathcal{A})$ equipped with a symmetric tensor product, while being braided monoidal with respect to the usual tensor product on $\mathcal{Z}(\mathcal{A})$. In the Tannakian case where $\mathcal{A}=\mathbf{Rep}(G)$ for a finite group $G$, the 2-category of $\mathcal{Z}(\mathcal{A})$-crossed braided categories is shown to be equivalent to the 2-category of $G…
Crossed-module crossed braided categories
本文为交叉模引入交叉辫子（及缎带）范畴，统一推广了多种已知结构，并利用上同调分类了分级向量空间上的此类结构，还通过扭曲局部模构造了实例。
A 3-categorical perspective on G-crossed braided categories
本文从3-范畴的角度，将G-交叉辫子范畴与群G的结构联系起来，提供了一种统一的构造方法。
Any simplicial Hopf algebra involves $2n$ different projections between the Hopf algebras $H_n,H_{n-1}$ for each $n \geq 1$. The word projection, here meaning a tuple $\partial \colon H_{n} \to H_{n-1}$ and $i \colon H_{n-1} \to H_{n}$ of Hopf algebra morphisms, such that $\partial \, i = \mathrm{id}$. Given a Hopf algebra projection $(\partial \colon I \to H,i)$ in a braided monoidal category $\mathfrak{C}$, one can obtain a new Hopf algebra structure living in the category of Yetter-Drinfeld modules over $H$, due to Radford's theorem. The underlying set of this Hopf algebra is obtained by an…
A crossed module is (A,H,d,\la) where d:A\to H is a homomorphism of groups and H acts on A, with conditions leading to a groupoid A\lcross H{\to\atop \to}H as an example of a strict 2-group. We give the corresponding notion of a quantum 2-group where we replace the above by Hopf algebras and introduce a new version of quantum groupoid. The work also suggests a natural notion of braided crossed module where A a braided-Hopf algebra in the braided category Z({}_H\CM) of crossed H-modules, although without the full groupoid picture in this more general case.
Generalized Yetter-Drinfeld modules, the center of bi-actegories and groupoid-crossed braided bicategories
本文研究双作用范畴的 $E$-中心，证明其等价于广义 Yetter-Drinfeld 模范畴，并引入双群胚交叉辫状双范畴概念，推广 Turaev 的群交叉辫状幺半范畴。
For a braided fusion category $\mathcal{V}$, a $\mathcal{V}$-fusion category is a fusion category $\mathcal{C}$ equipped with a braided monoidal functor $\mathcal{F}:\mathcal{V} \to Z(\mathcal{C})$. Given a fixed $\mathcal{V}$-fusion category $(\mathcal{C}, \mathcal{F})$ and a fixed $G$-graded extension $\mathcal{C}\subseteq \mathcal{D}$ as an ordinary fusion category, we characterize the enrichments $\widetilde{\mathcal{F}}:\mathcal{V} \to Z(\mathcal{D})$ of $\mathcal{D}$ which are compatible with the enrichment of $\mathcal{C}$. We show that G-crossed extensions of a braided fusion category …
Given a braided tensor *-category C with conjugate (dual) objects and irreducible unit together with a full symmetric subcategory S we define a crossed product C\rtimes S. This construction yields a tensor *-category with conjugates and an irreducible unit. (A *-category is a category enriched over Vect_C with positive *-operation.) A Galois correspondence is established between intermediate categories sitting between C and C\rtimes S and closed subgroups of the Galois group Gal(C\rtimes S/C)=Aut_C(C\rtimes S) of C, the latter being isomorphic to the compact group associated to S by the dualit…
We show that a quantum field theory A living on the line and having a group G of inner symmetries gives rise to a category GLoc A of twisted representations. This category is a braided crossed G-category in the sense of Turaev. Its degree zero subcategory is braided and equivalent to the usual representation category Rep A. Combining this with [29], where Rep A was proven to be modular for a nice class of rational conformal models, and with the construction of invariants of G-manifolds in [60], we obtain an equivariant version of the following chain of constructions: Rational CFT -> modular ca…
In this work, it is shown that the category $\mathsf{BXMod/R}$ of braided crossed modules over a fixed commutative algebra $R$ is an exact category in the sense of Barr.
Center construction for group-crossed tensor categories
本文定义了Natale意义下群交叉张量范畴的交叉中心，证明其构成辫子张量范畴，并推广了分次中心与等变中心构造。
Categorifying equivariant monoids
本文结合 PROPs、PROBs 与交叉单纯群理论，构造出编码等变幺半群结构的范畴，其代数范畴等价于带群作用的各类幺半群，并扩展至平衡辫张范畴和对合幺半群。
The Reduced Tensor Product of Braided Tensor Categories Containing a Symmetric Fusion Category
本研究针对含固定对称融合子范畴的辫子张量范畴，借助富集程序构造约化张量积对称幺模结构，并建立其与Drinfeld中心交叉辫子张量范畴2-范畴的等价性，还给出其在极小模扩张配对中的应用。
In the context of internal crossed modules over a fixed base object in a given semi-abelian category, we use the non-abelian tensor product in order to prove that an object is perfect (in an appropriate sense) if and only if it admits a universal central extension. This extends results of Brown-Loday (in the case of groups) and Edalatzadeh (in the case of Lie algebras). Our aim is to explain how those results can be understood in terms of categorical Galois theory: Edalatzadeh's interpretation in terms of quasi-pointed categories applies, but a more straightforward approach based on the theory…
Compact Semisimple Tensor 2-Categories are Morita Connected
本文证明紧致半单张量2-范畴在任意特征零域上具有Morita连通性，推广了融合2-范畴的相应结果，并由此构造了由第四Galois上同调群索引的辫融合1-范畴。
Modular $\mathbb{Z}_2$-Crossed Tambara-Yamagami-like Categories for Even Groups
本文构建了非退化braided Z₂交叉张量范畴，扩展了Tambara-Yamagami范畴，允许Γ群有偶阶且非平凡部分包含多个单对象。
A PROB is a "product and braid" category. Such categories can be used to encode the structure borne by an object in a braided monoidal category. In this paper we provide PROBs whose categories of algebras in a braided monoidal category are equivalent to the categories of monoids and comonoids using the category associated to the braid crossed simplicial group of Fiedorowicz and Loday. We show that PROBs can be composed by generalizing the machinery introduced by Lack for PROPs. We use this to define a PROB for bimonoids in a braided monoidal category as a composite of the PROBs for monoids and…
The authors have used generalised Galois Theory to construct a homotopy double groupoid of a surjective fibration of Kan simplicial sets. Here we apply this to construct a new homotopy double groupoid of a map of spaces, which includes constructions by others of a 2-groupoid, cat^1-group or crossed module. An advantage of our construction is that the double groupoid can give an algebraic model of a foliated bundle.
We show that the Peiffer commutator previously defined by Cigoli, Mantovani and Metere can be used to characterize central extensions of precrossed modules with respect to the subcategory of crossed modules in any semi-abelian category satisfying an additional property. We prove that this commutator also characterizes double central extensions, obtaining then some Hopf formulas for the second and third homology objects of internal precrossed modules.
Inspired by recent work of Batanin and Berger on the homotopy theory of operads, a general monad-theoretic context for speaking about structures within structures is presented, and the problem of constructing the universal ambient structure containing the prescribed internal structure is studied. Following the work of Lack, these universal objects must be constructed from simplicial objects arising from our monad-theoretic framework, as certain 2-categorical colimits called codescent objects. We isolate the extra structure present on these simplicial objects which enable their codescent object…
Hopf 2-algebras and Braided Monoidal 2-Categories
本文提出Hopf 2-代数的同伦范畴化，构造2-量子双并证明其对偶性，同时定义2-R矩阵并探讨其在4维扩展缺陷编织中的应用。
The Relative Monoidal Center and Tensor Products of Monoidal Categories
本文建立增广幺半范畴理论，定义平衡双模，构造相对张量积与相对幺半中心并证明其Morita对偶性，还在量子代数等实例中验证了相对中心的范畴等价性。
An Equivalence of Categories between 3-Crossed Modules and Gray 4-Groups
本文通过引入一个4-范畴并证明其单对象版本（Gray 4-群）与3-交叉模范畴等价，精确建立了3-交叉模与高维范畴之间的联系，有望用于刻画曲面纽结和高维流形的拓扑性质。
Computing $G$-Crossed Extensions and Orbifolds of Vertex Operator Algebras
本文发展计算辫子张量范畴 G-交叉扩张的工具，利用唯一性结果和与交换代数凝聚的交换性，确定格顶点算子代数轨形的模张量范畴，并推广 Tambara-Yamagami 范畴。
Categorical duality for Yetter-Drinfeld algebras
该文研究紧量子群G作用下(Rep G)-模范畴的张量结构，证明其等价于辫子交换Yetter-Drinfeld G-C*-代数范畴与生成酉张量函子范畴的对偶，并通过实例验证等价性。
A Galois connection between subalgebras and tensor subcategories
针对辫子有限张量范畴中简单交换代数A，构造其与对应张量子范畴间的反序伽罗瓦连接，明确闭对象特征及格反同构关系，还将结果推广至有限张量范畴典范代数、非退化范畴弗罗贝尼乌斯扩张及霍普夫代数的对应情形。
Cleft Extensions for Hopf Algebroids without Antipodes
本文引入无对径Hopf代数胚的裂扩张，证明其与σ-扭曲交叉积、带正规基的Hopf-Galois扩张等价，研究相关Ehresmann Hopf代数胚的同构性，推广了相关理论。
We study actions of discrete groups on 2-categories. The motivating examples are actions on the 2-category of representations of finite tensor categories and their relation with the extension theory of tensor categories by groups. Associated to a group action on a 2-category, we construct the 2-category of equivariant objects. We also introduce the G-equivariant notions of pseudofunctor, pseudonatural transformation and modification. Our first main result is a coherence theorem for 2-categories with an action of a group. For a 2-category B with an action of a group G, we construct a braided G-…
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