Autoequivalences of the tensor category of Uq(g)-modules

Details Autoequivalences of the tensor category of Uq(g)-modules Autoequivalences of the tensor category of Uq(g)-modules

2010-12-21

arxiv.org/abs/1012.4700v2

Mathematics

Quantum Algebra

5 pages; minor corrections

Scientific paper

We prove that for q\in\C* not a nontrivial root of unity the cohomology group defined by invariant 2-cocycles in a completion of Uq(g) is isomorphic to H^2(P/Q;\T), where P and Q are the weight and root lattices of g. This implies that the group of autoequivalences of the tensor category of Uq(g)-modules is the semidirect product of H^2(P/Q;\T) and the automorphism group of the based root datum of g. For q=1 we also obtain similar results for all compact connected separable groups.

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