Crossed modules and quantum groups in braided categories

Abstract

Let $A$ be a Hopf algebra in a braided category $\mathcal{C}$. Crossed modules over $A$ are introduced and studied as objects with both module and comodule structures satisfying a compatibility condition. The category $\DY{\cal C}^A_A$ of crossed modules is braided and is a concrete realization of a known general construction of a double or center of a monoidal category. For a quantum braided group $(A,\overline{A},\mathcal{R})$ the corresponding braided category of modules ${\cal C}_{\cO{A,\overline A}}$ is identified with a full subcategory in $\DY{\cal C}_A^A$. The connection with cross products is discussed and a suitable cross product in the class of quantum braided groups is built. Majid--Radford theorem, which gives equivalent conditions for an ordinary Hopf algebra to be such a cross product, is generalized to the braided category. Majid's bosonization theorem is also generalized.

54 pages, latex, 28 figures prepared by latex This is a completely revised and complemented version of hep-th/9408102,hep-th/9408106 submitted to {\it Appl. Categorical Structures}

References in corpus (1)

• Solutions Of The Yang-baxter Equations From Braided-Lie Algebras And Braided Groups

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