Tuesday, July 17, 2012

1207.3611 (Alexei Davydov et al.)

Z/2Z-extensions of Hopf algebra module categories by their base
categories
   [PDF]

Alexei Davydov, Ingo Runkel
Starting with a self-dual Hopf algebra H in a braided monoidal category S we construct a Z/2Z-graded monoidal category C = C_0 + C_1. The degree zero component is the category Rep_S(H) of representations of H and the degree one component is the category S. The extra structure on H needed to define the associativity isomorphisms is a choice of self-duality map and cointegral, subject to certain conditions. We also describe rigid, braided and ribbon structures on C in Hopf algebraic terms. Our construction permits a uniform treatment of Tambara-Yamagami categories and categories related to symplectic fermions in conformal field theory.
View original: http://arxiv.org/abs/1207.3611

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