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arXiv 1208.5693math.QA
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辫子霍普夫代数的二重结构

The doubles of a braided Hopf algebra

Alain Bruguières, Alexis Virelizier

摘要:

设A是辫刚性范畴B中的霍普夫代数.在B允许余端C的情况下,C是B中的一个霍普夫代数,我们在2008年定义了A的双D(A),它是B中的一个拟三角霍普夫代数,其模范畴同构于A-模范畴的中心作为辫子范畴。这里,拟三角意味着被赋予一个R-矩阵(我们对B中的霍普夫代数的R-矩阵的概念涉及B的余端C)。一般地,即当B不一定允许余尾时,我们在B的中心Z(B)上构造一个拟三角Hopf单子d_A,它的模范畴同构于A-模范畴的中心作为辫子范畴.证明了Hopf单子d_A不可用霍普夫代数表示.若B有余边C,则D(A)是Hopf单子d_A与C的向量积.等价地,Hopf单子d_A是霍普夫代数D(A)与霍普夫代数C的交商.

英文摘要:

Let A be a Hopf algebra in a braided rigid category B. In the case B admits a coend C, which is a Hopf algebra in B, we defined in 2008 the double D(A) of A, which is a quasitriangular Hopf algebra in B whose category of modules is isomorphic to the center of the category of A-modules as a braided category. Here, quasitriangular means endowed with an R-matrix (our notion of R-matrix for a Hopf algebra in B involves the coend C of B). In general, i.e. when B does not necessarily admit a coend, we construct a quasitriangular Hopf monad d_A on the center Z(B) of B whose category of modules is isomorphic to the center of the category of A-modules as a braided category. We prove that the Hopf monad d_A may not be representable by a Hopf algebra. If B has a coend C, then D(A) is the cross product of the Hopf monad d_A by C. Equivalently, the Hopf monad d_A is the cross quotient of the Hopf algebra D(A) by the Hopf algebra C.

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